Advice for a making a move on him?

Ok so my boyfriend and I (of 2 years) are going to be visiting a private spa retreat this week where there are individual couple hot tubs and pools and after discussing what we wanted to do during out stay, I know he wants to spend time down at the private hot tubs. I have always wanted to have some fun in a hot tub and think this is the opportunity to do it. Any suggestions on how I could make a move on him? Any other ideas? Thanks