Hope you enjoyed the Portugal trip, it was so much fun!! As always here are some things we did and saw that I think are worth mentioning if you're thinking of traveling there:
Sites: Overall, I think Lisbon is a great place to just walk around. If you go to the city center, there's a great walkway along the water with bands, food, etc. There are tons of outlooks where people get drinks and watch the sunset which is so pretty. Castelo de S. Jorge is the castle we went to that overlooks the whole city and it was beautiful!
Boat Tour: Definitely recommend doing one of these for this city!! There was unlimited wine and lots of sites along the water we wouldn't have seen otherwise. Go during sunset - makes it so much better.
Food: I say this to everyone - but Lisbon had THE BEST food!! I think I was also missing some different cuisines, but I would recommend looking at the top-rated food places here and trying and get a reservation or just waiting because it's worth it. Dear Breakfast was one of our favorites - we ate there every morning.
Going out: Lisbon is really fun to go out in - our experience was just not the one to look at. They have a strip of bars and everyone gathers in the streets. It looked really fun, but again we don't really know too much about it because we didn't go all out here. I would ask for advice from waiters about places to go out because based on your age they probably know good places.