Hi Myriam,
Thank you so much for visiting the Disney Parks Moms Panel with your question. My family stayed at the Treehouse Villas at
Disney's Saratoga Springs Resort & Spa this past year, and we had so much fun. It is a relaxing and peaceful experience, and the Treehouse Villas are lovely.
I did not recall seeing any golf carts while I was at the Treehouse Villas at Disney's Saratoga Springs Resort & Spa, so I called Walt Disney World to check. A cast member let me know that golf carts are not allowed at any of the resorts at Walt Disney World except for Disney's Fort Wilderness Resort and Campground, so you will not be able to have a golf cart at the Treehouse Villas at Disney's Saratoga Springs Resort & Spa.
My family also likes to stay at Disney's Fort Wilderness Resort and Campground, so I do know that golf carts are used there often. Disney's Saratoga Springs Resort & Spa is set up differently. The section with the Treehouse Villas is secluded and fairly small. You will be able to quickly walk anywhere you need to get within the Treehouse Villas section. If you want to access the main area of Disney's Saratoga Springs Resort & Spa, you can either walk along a path, or you can take a bus that runs back and forth between the Treehouse Villa area and the main area of Disney's Saratoga Springs Resort & Spa.
I hope that these thoughts are helpful for you, Myriam. Have a wonderful time planning your magical vacation, and please do let us know if you have any further questions.