Scooters won't be on an issue in the parks
TMs can assist you with a Manuel wc for rides you need to transfer to if need be
Read the UO site on disabilities for more info on that
I've used wc in the park before with no issues
You can stay with the family and use the child swap rooms to wait in when there is a ride you can not do
If your medical condition is the back, there will be rides that should be avoided
Check with your doctor on his position what you must avoid