Setup strategic 'hidden camera' in the room, just have the talent come in for a regular old shoot without knowing the camera is there. This way you are able to get natural unplanned behind the scenes action.
I believe a surfer who is into this type of stuff - is looking for real candid shit, not perfect shots. Sometimes objects in front of the camera (ex: a plant/towel) - blushing, giggling and all of that other bs can turn a person on who is into that type of niche.
This is just what I would do, i'm no expert.
