Almost anything, or nothing. You all need to be leaders, usually many followers. We have saw threesomes to overly boring.
When we went in Oct with the Octoberbreast group the ONLY ones in the Hot Tub past 10pm were us and the AIWC. The bartenders are good about letting you stay in past 11 (supposed to close, we were there until 2am), and they would keep bringing us concoctions they made up all for a simple boob show from the ladies haha. The hot tub tho was not very hot at all, water was lukewarm at best.
Been to Hedo Hot tub at night so we have seen some crazy things,cant imagine it would be like that, although nude at night will be nice.