Mine is 19MO. We prefer fenced in parks or play areas. Also bells on shoes or Wee Squeaks will help you both hear and see her while she plays even if she’s far. Could you maybe carry a small light folding lawn chair with you so you can sit or walk as needed? Then you can set the chair right by play structures. Parent benches are generally further away from toys/equipment than I prefer but there’s no reason you can’t sit closer if it helps.