If you're up for it, there should be someone offering Parasailing (you go out on a boat, and they strap a paprshute to you-thats tethered to the boat-and you go up as the boat drives around the lake) the view is amazing!
There's also the the paddlewheeler boat by the old bridge (new one just opened) that might still do crusies every night. They have a restaurant on board and a bar. If you just want to relax, the top deck is open with plenty of seats and rail space.
If you decide to go as far as Penticton, they have a nice "gentleman's club" called Slack Alice's that was a good time whenever I went
