Oh my frikin god i remember what i used to do...
first, i used to run around like a ninja on the carnival areas, then
I went to that place that is 80% water, and the other 20% is cliffs. One of the levels you gotta clean the underwater guy's teeth? yeah, so i always got in the boat, and you could drive it around with your FLUDD thing, and i always used to just drive it around to the small islands. fun stuff was fun...