Activity for AlmostMrsT

We are in the awful position of realizing FH's bachelor party is falling through the cracks. His groomsmen aren't very organized, and the close friend he appointed to organize the event (since he lives in the area they were planning on going to)...

Our favorite couple-friends are planning their honeymoon for a similar destination and time of year. It came up in conversation recently, and our first thought was, would it be crazy to go together as a group of 4? Of course we would respect each...