Jedi Training Center Answered

I live on a lake and want to put in some fun stuff for fun and training.  Free stuff is a plus...budget is $50 or so.  Must be able to take out of the water in the fall.

First idea I had was to anchor some of those (closed) blue 50 gallon barrels so that people could try and stand on them and fight each other.  I haven't tested this out yet...they may be just too unstable.  I also have to figure out how to tie and anchor them to a cinder block on the bottom of the lake so they can just stay there and float.  Any ideas?

Other things....log rolling....diy diving board....let your imagination go.  i haven't found any pics or sites on the internet on this topic, so any ideas appreciated.

Thanks!