You only have 3 items per team so after the three people go, the next people go and move one of their items to a new place. Lots of creative ways to switch this up: create obstacles, 3 legged races, crab walk over to it, etc.
Bachelor and bachelorette party together. Guys and girls do their own thing in the morning meet up in a field play some competition games filled with dares for the bride and groom. Completed with a Bon fire and maybe camping.