Babysitter - Full-time / Part-time

I am looking for a responsible, kind, and reliable caregiver for my 12-year-old son for one full day (Saturday) while I attend a retreat nearby. He is independent. and does not require any special care. I would like someone to spend the day with him, keep him company, and ensure he is safe. The day could include breakfast or lunch together, swimming at the hotel pool (if permitted), board games, a walk, visiting a nearby park, going for ice cream, or other age-appropriate activities. A valid drivers license and reliable transportation would be a plus, but are not required. References and experience with pre-teens are preferred.