We hit the grandparents' pools (one on each side of the family) and the beach

Our local library doesn't have story time in the summer but they have a summer series that they do for school age kids but my preschoolers loved it last year too! They bring in singers, plays, and magicians and have a reading incentive where the kids earn coupons for places like rita's waterice

We're also lucky that DH used to work for a local amusement park when he was a teen and my FIL is still friends with owner so we get free tickets for there too. We also have a local zoo that is free too and a great park (although both of them tend to be very crowded).