Hi Allison,
If it works for you to stay at a deluxe resort, I'd highly recommend the Polynesian. To get to the Magic Kingdom, you will be able to take a short boat ride or monorail over to the park.
Traveling to Epcot is also simple by walking over to the Ticket and Transportation Center to catch the monorail to Epcot.
The trips to Disney's Hollywood Studios and the Animal Kingdom, however, would be by bus.
I don't want to leave out that taxis run throughout all of WDW. If you are a pinch and don't want to wait for a bus, especially on the return home from parks in the evening when the buses can often be standing room only, you can easily take a cab which will travel quickly, too.
If you'd like to explore the Polynesian more, you may want to look at Steve Seifert's website: http://tikiman2001.homestead.com/ . It is an impressive collection of photos and information on the resort.