There are giant waves out at sea that boats will take you out to. I can't recall the name of the area but the waves are gigantic (like in the pic) and each surfer will have someone with a wave runner (like in the pic) to "spot" him/her in case something very bad happens while riding the wave. It's quite spectacular to watch. You have to be very, very, very good to do this (and have money to pay the boat and crew).I dunno.
It was just one of the first up on google.