Yep I always wear flip flops. You have to keep them on on the Hulk and you have to take them off on Dueling Dragons (just sit on them and they're fine I vaguely remember being able to leave them in some kind of storage pocket on Dr Doom.
Hope the helps
Oh my gosh I third this! Thank goodness DH was standing righ next to me the first time. After that I didn't let go of him and still almost lost it a couple times!!
But yeah, I always wear my flip flops everywhere. It's not a problem there!
The slipperiness depends on the flip flop brand/bottom. My Joe Boxers are like ice skates, but I've never had a slipping problem with the ones I get from Target. I love 'em for rain because I'm not sloshing around in soaked socks and tennies.
Unfortunately, finding out which brands are or aren't slippery and if that is true in every section of the park can be a painful experiment, especially if you decide it's great on the red pavement, go trucking along and hit a patch of white stripe (go ahead, ask me how I know that )