Just make sure you get your ass to Typhoon Lagoon. That was my favorite thing to do while at Disney the last time I went. The wave pool is amazing!
I think this website is the best Disney/Universal planning and cheap, official tickets: Disney World tickets | Discount attraction tickets | Undercover Tourist
You might be able to find cheaper elsewhere, say, buying peoples' unused days on their passes, but that is such a pain in the ass and you have no idea what you're actually buying most of the time.