I just came back from a three day trip. Get a multi day pass with Park Hopper, that way you can bounce between the parks and get to rides when the lines die down a bit (like less that 45 minute waits). Also, take advantage of the Magic Mornings (going in an hour early before the regular crowd). Head straight to Hyperspace Mountain, or the line will be at a 60 minute wait in seconds. The Radiator Racer ride was always between 60-120 minutes, head straight there one morning. Use the Fast Passes to your advantage, we got in at 0900 and ended up getting a pass for Hyperspace for 1830! There are a couple of "discount" ticket places just across the street from the park, but park tickets are never really discounted much more than $2-$5 buck. Costco may be the best bet.
Bring drinks and food into the park, expect long lines for everything, but over all enjoy the trip.
Airwolf