My stepdaughter is going to be 14. She is joining me the first day and possibly another day if she finds she likes it. She is mature enough that I am not worried if we separate. She has a cell phone and will be bringing it with her. I’m more concerned about making sure she drinks enough water. She is an athlete (plays basketball and soccer year round) so she knows the importance of it but she is not always the best at remembering. So I’m going to work on training her to drink before she is thirsty and to constantly reapply sunscreen. Having a plan to meet up in a town is a great idea. I like the idea of meeting by the water. Best way to gauge things is would you be comfortable leaving your child home alone for a few hours and not worry about the house burning down or them getting into trouble. If they are mature enough to stay home alone for a few hours they are mature enough to ride/sag on their own if need be.