Do all of the Colliseum tournaments all three ways, they are fun. If you can figure out how to do the timed courses non-insanely-high levels, then you will probably have enough strategy to beat anything in the game. Take some time to do stuff with your Gummi Ship, annoying as it may be, it makes the Gummi Ship rides more fun in the end. Magic and summons are your friend, not your enemy. If you chose the Magic Rod in the beginning of the game, you aren't going to get a lifesaving ability called Second Chance for Sora probably until after the point in the game where you probably needed it, so be patient. Otherwise, you'll get it soon enough and life will be grand. Other than that, every once in a while go back to Traverse Town and run around and kill some heartless, especially in the Gizmo Shop, to gain a few more needed levels every once in a while. And be thorough in your search of areas, there are a lot of good items to be found. If you need munny, "fight" some White Mushrooms to get the items that they drop, they can be sold for 250 munnies each.