I will be going to Universal with my mom this year. While she can stand and walk for short periods, she has mobility issues and absolutely can't do anything close to the kinds of miles required of Universal. So we're renting a scooter. This a new experience for my family and I'm desperate to talk with some who has used these before. Can anyone help? My questions: - Are the 3 wheel scooters stable? Is there a greater risk of tipping compared to the 4 wheel? - Are sunshades good or bad? They look like they could cause a problem getting on and off the boat.... - Any tips, tricks or hints?