Question about Lake powell?

so i am going to lake powell in a month with a friend and her family. i have been boating once (hahah) and i'm not much of a fan of water. So what exactly do you do at lake powell besides boat? we're on a house boat for 10 days...i'm excited but also very nervous...more than anything it's fear of the unknown. any tips on what to expect/what to bring? how much swimming do you do without a lifejacket (cuz i hate swimming and don't really know how)...i guess i'm just asking kinda what to expect cuz i'm pretty nervous.....:)