What to do during a boring beach vacation?

Here’s my problem, I don’t like beaches but I have to go. Just me, my mom, my dad and my 9 year old sister. I’m 16 by the way. And I don’t like to swim or go in water and we’re going to be there from saturday morning ‘til monday night. I’m charging my ipod, so that’s one thing I have. But I have no idea what to do, it will be so boring and I’d rather not even go, but I don’t have the choice. We’re also staying in a hotel, not a cabin and we haven’t done anything like this since I was little, usually are trips are going to places we’ve never been and shopping.