I like bookingbuddy.com to easily research airfares on all the major websites at once. From there, if you want an even better deal, once you find the flights you want, go to the airlines website and price it out on their site. It often will be cheaper than anywhere else. But bookingbuddy.com helps to filter the flights.
I would check biddingfortravel.com for bidding tips on Priceline. Since you are taking a last minute trip, you may be able to find a good deal on Priceline for a 3* hotel. I wouldn't go lower than 3* because you could really end up in a dive. Some people have gotten really great deals at Marriot or Hyatt. Depends if there is a convention in town, etc.
Are you renting a car? Bookingbuddy also has the ability to check all the car rental places online at once. Again, I would compare and then price out individual websites to see if they are even cheaper.
Also, check getawaytoday.com for hotel and park ticket packages. They have good prices sometimes and they have 2 Magic Morning early entry w/ each ticket.
Good luck!
ETA: Also check Southwest airlines' website as they do not partner w/ other airlines and that's the only way to check their prices. They will not show up in a booing website like Expedia or Travelocity.
