We're staying at Dixie Landings. My sister is in a wheelchair and her health problems don't give her much stamina even in the wheelchair (lung/heart issues). Are all the buses that come to take guests to the parks wheelchair accessible or will we have a longer wait until one comes by? How long would you guess we'll wait? Do they go from the resort directly to a designated park or do they hit several in which case she could be in for a long ride? How long should it take to get to a park? Thanks so much!