my cousin and our moms are in the process of picking a cruise as a graduation present. I think we're going on one to the eastern carribean. My question is what is there for two 18 year old girls to do? I've heard that it's a weird age because you can't drink on the ship but you're treated like an adult anyways. Also, how does drinking in the ports work? And finally are the rooms big enough for all 4 of us to stay in one room?