You can see the Pride Land puzzle pieces
starting here, but all the tough ones are the same: Dash to full speed, then jump and pray. If you're going to fall short, you can swing the Keyblade to buy maybe one second's extra air-time. (Check the video for the Elephant Graveyard puzzle piece and you'll see what I mean.) I'm just learning that trick now, but it occurs to me that Combo Master could be used to maybe go even further, but no promises.
It's obvious Japanese gamers have a different button setup than us at times like this. In Japan they'd hold Square and press X to jump, that's easy. That's just Mega Man X on a different angle. But holding Square and pushing O? They're just a little bit further apart but that's all it takes to make things awful!