I went with a group of friends to Mudfest. It is pretty much exactly how it sounds. Get on a bus and go up to an area known for its mud flats. We spent the day going down mud slides, traversing through mud obstacle courses, mud wrestling, and finally showering off in the ocean.
The pictures are from Laura's camera - we had these thick rubber bags to store money, phones, and cameras inside. The festival seemed like it would be a kid friendly one, except for all of the drunk foreigners wandering around. Not a family affair, but I highly recommend it to anyone wanting to spend a weekend day drinking, running around muddy in the sun.
I can't wait to go back next year.