I only needed a one-way ticket because I was meeting my wife at the Swan and Dolphin resort, where she was attending a conference. And she had already rented a car.
Swan and Dolphin was enormous. Rooms were fine. Not sure how much they cost because my wife's company was paying for them. They had a mini fridge and free Starbucks coffee every day. Great gym. Two pools. And two beaches with chairs, volleyball, etc. Restaurants were very expensive.
From this resort, you could walk right to Epcot. You could almost walk to Universal Studios, too. The Boardwalk Resort (I think that's what it's called) was right next to Swan and Dolphin. Very scenic with lots of shops and restaurants.
I only went to one park while there - Animal Kingdom, on a Friday. It wasn't too crowded. Some rides were difficult to get onto early, but extremely easy starting around 4:30 pm.