Inside the bedroom, there was a bathroom on the left, a foldout couch on the right, and a table and chair against the back window. Above the couch was a lever to pull the top bunk down from the ceiling.

Train attendants offer turndown service to set up both beds, but as an experienced overnight train traveler (I've spent 193 hours on them), I did it myself.

When I pulled the top bunk down from the ceiling, I found a ladder, straps to hook to the ceiling, and bedding. I hooked the ladder to the end of the bed and climbed up to fix the straps. There was also a pair of pockets on the wall where I stored my water bottle and phone.

If you're new to overnight train travel, I wouldn't recommend the top bunk. The shakes and rumbles of the rails felt more intense up there than on the couch below. But I've slept on so many trains that this motion rocks me to sleep now.

I slept for seven hours and woke up feeling well rested.

I slept in the top bunk above my brother growing up. Back then, it felt like just another mundane detail of my day. But as an adult, lying up there in that Amtrak bed, I was overwhelmed with nostalgia. It was like traveling back in time and having the chance to appreciate something I never did as a kid.

With the couch still intact, adding the top bunk gave the tiny space another piece of furniture without taking up more square footage. I stored my belongings on the couch below and used the bunk as a loft throughout the next day.

Beneath each corner of the couch was a pedal that read "Push for bed." With my foot on the pedal, I pulled the bar spanning each cushion to make the bed. I had easy access to the power outlets and a cupholder by the window.

The bottom bunk was wider than the top bunk, so I had more room to stretch out. At the same time, the lower bunk took up a lot of the floor space. I suddenly felt cramped. There was no longer space to stand in front of the sink, so I brushed my teeth in bed. I stuffed all of my belongings in the corner of the room.

I slept for eight hours in the bottom bunk and felt just as well rested as I did the day before.

The window in my room was only visible from the bottom bunk. So I appreciated waking up, opening the curtains, and seeing the sunrise without leaving my bed.

I'm sure most would prefer the bottom bunk for its size and slightly smoother ride, but on future overnight Amtrak trips, I'll always take the top bunk.

If I'm riding solo, it'll make the room feel bigger. But even if I'm not, I'll give my partner the bigger bed and enjoy feeling like a kid again.

To reach the small town on Penobscot Bay, we flew from New York to Portland, and our friends picked us up from the airport for a two-hour drive up the coast.

Belfast was incorporated as a town in the 1700s, but it started to prosper in the 19th century as a hub for maritime workers, the city's website says. For about 100 years, Belfast residents built wooden sailboats, operated steamships, and transported goods, from ice and apples to hay and fertilizer.

Then, in the 1980s, creatives flocked to the town, transforming it into an artists' oasis with galleries and warehouse studios.

The waterfront town has about 7,000 residents.

The architecture in Belfast combines traditional New England-style homes with old-world styles from the Italian and Greek Revival eras, the Boston Globe reported. This gave the town a European twist on the classic New England aesthetic.

My friends said Belfast gets tourists in the summer, but it didn't feel crowded. We never waited too long for a table at a restaurant, and I didn't see many large groups.

I saw more historic inns than traditional hotels, which could be because tourists visit for unique accommodations.

The inns looked like gigantic mansions, and seeing them up close made me wish I'd booked just one night in a place like the Jeweled Turret Inn. The bed and breakfast, decorated with antiques, is a 19th-century Victorian landmark on the National Register of Historic Places.

There's also the Alden House Inn, a Greek Revival building dating back to 1840. I spotted its porch filled with guests on a weekend afternoon and longed to hang out there.

Belfast is pedestrian-friendly, scoring 71 out of 100 on Walk Score.

From my friends' apartment, we reached hiking trails, the waterfront, and the downtown area — all on foot.

My friends also live steps away from a farmers market and the Belfast Armistice Bridge, which pedestrians use to cross the Passagassawakeag River.

My friends live less than 5 minutes from the Rail Trail that runs along the Passagassawakeag River.

I spent one day working remotely from Belfast, and we took a quick hike during my lunch break.

I was impressed by the hillside views and the landmasses in the distance, covered in rich green trees. It was an ideal place to refresh in the middle of a shift.

My friend told me one of the coolest things about Belfast is that there are so many local shops. There's no Walmart, Target, or Costco in town. The only brand-name stores I saw were Walgreens, CVS, and Dollar General.

The Press Herald reported that Maine towns are known for their small businesses. Belfast, in particular, has a plethora of locally owned retailers, from a general store and a DVD rental store to shops selling vintage dollhouses and handmade clothing and furniture.

We went to a farmers market selling local produce and foods during my trip, and my friends cooked up a feast.

We had a watermelon and feta salad, roasted duck, lobster mac and cheese, and potato salad with duck fat and herb-infused dressing: dill, parsley, and garlic scapes.

The ingredients tasted so fresh, as did the local pastries and bagels we got for breakfast.

Acadia National Park is just a 90-minute drive from Belfast. We took a day trip there on a Saturday, and I was surprised to find it wasn't as crowded as most national parks I've visited on weekends.

The coastal park, surrounded by islands, looked majestic in the hazy weather. We hiked through forests to the rocky coastline, where we went tide-pooling and found a massive cave. It was even more picturesque than the trails in Belfast, and it helped me see how the state of Maine inspired my favorite American writer, Stephen King.

My friends in Maine have a super sweet, active dog named Zeus. He accompanied us on nearly every adventure during our trip, from restaurants to the Rail Trail to Acadia, one of the most dog-friendly national parks in the US, according to the NPS.

Having Zeus with us made the trip so much goofier and more fun. It wouldn't have been the same without him.

Aside from being a unique town with so much to offer, Belfast would be an ideal destination for tourists looking to travel sustainably. Eco-travel experts have said that supporting local businesses and getting around without a car are responsible practices for the health of our planet.

During my next trip to Belfast, I'll spend more time browsing local shops, book a stay at a historic inn, and take more day trips to places like Portland. Plus, I'd love to see Acadia on a day with clear skies.