Going on a cruise during 2nd trimester?

Hello!

This is my first pregnancy, and my family is going on a Royal Caribbean cruise the week of Christmas. My mom actually surprised my whole family with the trip. My husband and all of my siblings and their SO's are going. I'll be approx 17 weeks at the time. I'm really trying to be excited, but I'm also pretty bummed that I feel like I'm going to miss out on 80% of the fun.
Not just not being able to drink, but I won't be able to do most of the "thrill" stuff either. Has anyone here gone on a cruise while pregnant? What was it like? Did you feel like you had enough to do? We're on a SUPER tight budget, so I'm really trying to avoid out of pocket extras as much as possible, which I feel like is adding to my stress. (the ship is Allure of the Seas for anyone familiar)