What are some fun and inexpensive things to do with kids during the summer?

Here are a few ideas for things to do with kids to do with kids in the summer that are inexpensive:
1. Go for a picnic
2. Go for a bike ride
3. Go for a hike
4. Go swimming in a pool or a lake. But do take necessary precautions and be safe.
5. Camping
6. Go to a water park.
7. Go to a park or a splash pad
There are many such things that are inexpensive or even free that one could do with kids during the summer.