Hooray! Congrats on going- and even more congrats on graduating!
I love going to WDW, and my now-husband and I have saved money by doing some things that others may or may not agree with.
1) Go camping. The weather's nice, Ft. Wilderness is on property, and it's a 1/3 of the price of any value resort on property. And it's not very rugged, so if you're not used to camping, you will find yourself very comfortable. The camping board on this forum is super helpful...
2) If you aren't going camping, you could stay on I-drive. I would recommend being prepared to wake up early and drive to the TTC each day since the buses from the hotel aren't always free, and the schedules kind of suck. But I-drive is really fun, and walking around Universal's boardwalk was super fun too!

Although, I-drive has insane traffic, just a fair warning. lol
3) Pack a lunch. Drink water from your own waterbottle. Treat yourself to one nice dinner, and only buy snacks/desserts/drinks when you really feel you must indulge yourself. By waiting until our last EPCOT night to treat ourselves, packing lunches, and making our own dinner and breakfast, my husband and I saved hundreds of dollars (and still enjoyed a jalapeno pretzel & an adult beverage). I know it's not the best thing in the world, but every dollar counts!
3b) Souvenirs, while not food, are really nice to have- even if you don't need them. Our strategy was to decide what souvenirs we wanted ahead of time, and focused on finding them. This time we wanted to get a magnet of each park, a Tree of Life statue (couldn't find!), and a set of shotglasses (because we're classy like that). I always end up buying a t-shirt, but I could live without it. By knowing what we want ahead of time, we don't overbuy and we don't feel so overwhelmed that we don't buy ANYTHING. Which would be AWFUL.
4) I've never been to Seaworld or Universal, so I can't comment on their value. But I found that it was easier to save money buy getting parkhoppers at WDW. For our Disneymoon, which we spent under $2 grand (this is including buying some new camping supplies plus our groceries for the week), we spent 3 days at the parks but used park hoppers. Or we could have not paid for parkhoppers but stayed for 4 or 5 days instead. We got a better value by parkhopping, of course! And we got back in time to finish our graduate degrees. ^_^ What I'm trying to say, is more is less, sometimes! DISCLAIMER: My honey bunches and I are not rollercoaster/fast ride people. We didn't get everything done that we wanted to, but we just enjoyed the parks, the atmosphere, and most importantly, each other. Don't go commando. Just plan smartly. And you'll enjoy yourself if you relax and take breaks.
GAH SO MUCH ADVICE

Hope this helps!
