There are many thousands of people who make the pilgrimage to the Mecca, Gold's Gym Venice every year. It costs $50 a day to train there for a 24 hr pass. Robby lives in this area and is in Golds and surrounding all the time. He'd easily be able to hook up with some of those many tourists.
How about a $250 spend the day with Bodybuilding legend Mr. Universe Robby Robinson package where you/your group meet him at Golds and train with him for 1 hr and then go to the Firehouse for Lunch/Breakfast, then take a 1.5 hour walk along the boardwalk to the Muscle Pit then back to Gold's? He'd just hang out and BS/tell stories, take some pictures with you, etc.?
He could get a cheap secretary and have her schedule and book these one each week for Sat/Sunday, minimal time commitment (3 hours), and make $500 a week (plus you'd have to buy his lunch and pay for your own Gold's). Maybe he could make a lot more.
Hell there's tons of mini-celebs around Gold's that maybe could offer something like this.