Always wanted to do this..
This looks absolutely amazing. Raft building is a great way to get the team building on the go.

I used to work at a company a few years ago which specialised in getting the team together on a regular basis in order for everyone to feel more comfortable and happy at their job but we never got round to doing stuff like this! I would love to try this out some day.
I remember raft building when I was a kid with my brothers.. It was awesome fun..
Wish I could be out with those kids now on the raft in the picture