This is an excellent camp for tweens and teens... I think it's ages 10 and up.  The kids get to dress up like warriors and wizards... make armor, do swordfighting and fight off Zombies and monsters... and get treasure.  It's a week long live away camp in central Massachusetts.  My husband wishes they had this when he was a kid!  They have more information on the website:  www.guardup.com

TIP:  I think they limit it to a small number of kids.