I feel like this summer went by so fast that my girls didn’t even enjoy it. They only went swimming…

I feel like this summer went by so fast that my girls didn’t even enjoy it. They only went swimming once and I feel so bad they barely left the house. Between having the house built and worrying about baby #3 I completely forgot. Any last minute activities we can do before school starts back august 20th? Cheap stay-cation ideas also welcomed!