Dogs in the Summer

What does everyone do with their high energy dogs in the heat? I walk 2 dogs for a client in the morning before it gets too hot but around 2pm one of them has energy he needs to get out. She doesn’t bring him to dog parks because he is newly adopted and can be unpredictable with dogs he doesn’t know. We talked about taking him to swim but I don’t know where is safe due to the algae and would also need it to be close to the city so we could go everyday. Thank you in advance for any tips/ideas!