My wife and I have enjoyed walking inside Disney World. You can park at Port Orleans Resort, just ask for a temporary parking pass. There are paved paths along the waterway with wonderful views. There is a loop path from Downtown Disney that runs through Sarasota Springs and back to Downtown Disney. Also, we have parked at the parking area outside Fort Wilderness and walked and biked inside the campground. There is a paved walking and biking path from the horse barn near the waterfront of Fort Wilderness to the Wilderness Lodge.
My wife and I are staying at Hilton Head, SC this week on our way to the Wyndham Cypress Palms next week. We stayed in Florida last winter booking last minute with great success. We plan to do the same thing this year. Perhaps we will see you on the path!