It's all in here...spinners, tandem, menacing sharks (thank God for Batman's repellant), and even Greg Brady doing his own surfing--no really, see above. And as though you needed more evidence that surfing is the coolest thing ever...you'll see the only instance that Gilligan's actually got a shot at Ginger AND Maryann and it's when he's...uh...surfing in a lagoon.
Plus, the Beach Boys supply the soundtrack, which ain't ever bad.
Check out the video here:
Mr. Ed, Gilligan & Batman Surf!
Cheers!