Summer break is always hard because most people don't want to follow a strict schedule. If you're able to develop a routine that will help. Good luck.

A visual schedule, starting to review it before school ends, and each morning. Can help a lot. You can always add or remove an activity from the schedule, if she’s ok with some change, so you don’t have to follow it perfectly. But knowing there will be a plan can help!

Same! My daughter is 4. I’ve been setting up different stations every morning (coloring, yoga, reading, and sensory). We also have outside time. She’s really all over the place closer to bed time. I’m going to try taking walks around the neighborhood. She will be attending an extended school year program starting after the holiday.
I also signed her up for a few classes once a week (dance, and running). They are each one month. The first one is in July. I just wanted to give you a few ideas. Check the community centers for the towns or the city. I also try breathing (smell the flower, blow out the candle). That definitely will slow my little one down. I hope this helps.