Board activity decreasing? That is really no surprise, or any big deal. It's normal for board activities to fluncuate during the year. It's not going to stay the same all the time.
I don't really have any summer activities. Back in IL, I used to ride my bike during the summer, but since I moved here, I have not been able to because there's no sidewalks close to my house and we live next to a busy road.