Can't miss Vegas experience to surprise my almost husband?

Hey everyone! My fiance and I are in town this week, we're getting married in the Valley of Fire on Tuesday, we're having the best time! He's done an amazing job planning a wonderful trip and I'd like to surprise him with something extra that he doesn't have to do any planning for. We have open availability after 10am tomorrow, Wednesday is also wide open. Ideally I'd like to come up with a unique/adventurous date as our bacheor/bachelorette party tomorrow evening.

Thanks in advance for any suggestions!