Roughing it in a life raft, for an hour
As part of the Noord Holland biennial you can spend an hour or more on a life raft on the IJsselmeer (PDF) near Hoorn. Cell phones are not allowed, but there is apparently a way to signal the organisers that you wish to get off prematurely.
The event was set up by artists Marjolijn Dijkman and José Carlos Martinat, who hope you reach enlightenment in that short time. If you wish to reach enlightenment in a rescue vessel equipped with a Martini bar, sheep skin rugs and a DVD player, you should contact a different artist.