bus info on GF from easywdw:
Travel to the Animal Kingdom and Hollywood Studios is via bus. Most of the time, bus service will be shared with at least one other resort. The Grand Floridian is usually picked up and dropped off last which can equate to longer transit times coming back from the Parks and the strong possibility that it will be standing room only on the way to the Parks. It isnt so bad when the Grand Floridian shares buses with the Polynesian, but plan to spend an extra 15 minutes on the bus if its sharing with the Wilderness Lodge. The Grand Floridian is about as far away as possible from the Animal Kingdom and not particularly close to Epcot or the Hollywood Studios either. Unlike the Polynesian, it is not possible to walk to the Transit Center to get on the Express Epcot Monorail and there is no walkway to the Magic Kingdom like there is at the Contemporary.
The times below are calculated after the bus, monorail, or boat leaves for its final destination.
Hollywood Studios via Bus: about 20 minutes
Epcot via Resort Monorail then switch to Epcot Monorail: about 35 minutes, depending on how long it takes for the Epcot Monorail train to arrive.
Animal Kingdom via Bus: about 25 minutes
Magic Kingdom via Monorail: about 5 minutes
Magic Kingdom via Boat: about 10 minutes