I've heard good things about Escape, but I'm going to vouch for Pedalheads which has a great mtb program for kids that many people don't know about.
I wanted to put my son (who was 7 at the time) in Escape last summer. I was looking for a week long camp where he could ride all the kid friendly trails on Fromme-Bobsled, Floppy, Griffin, Kirkford, etc. The 3pm pickup time didn't work for me so I put him in Flow (Pedalheads) thinking it probably wouldn't be as good, maybe too boring, but it turned out to be exactly what I was looking for. It's basically the same thing as Escape, but half day.
https://www.pedalheads.com/mountainbiking
Don't confuse this with regular pedal heads, which is more focused on complete beginners, road safety, and intro to some easy trail riding. Their mtb camps are different, more challenging, similar to Escape.
Escape does a better job of marketing and explaining which trails they'll be riding. Pedalheads doesn't have a reputation for mtb camps, but imo they're just as good as Escape, maybe better. They got a ton of riding in. And riding is all they did, no filler time. 2 coaches for 5 kids. Lead coach was a skilled DH racer and super positive and engaging with the kids. The pace was good, they got on plenty of cool trails (including some I didn't expect), and my son was never bored. It was also less expensive than Escape. So it exceeded my expectations.
For Pedalheads/Flow, the first day meeting place is at a coffee shop down the street from Brockton school, but after the first day, drop off/pickup is at the Fromme gate.