First you simply take any and all the mats that you have at your camp.
You then proceed to spread them out in a gym or any large area, preferably indoors. You have the kids take off their shoes and sit in the middle of the mats. Designate one or two taggers depending on the size of your group. (Remember the more kids you have the more crashing they may do!)
The taggers chase the other kids on the mats only. The kids can jumps from each mat to another mat and avoid the tagger. They must stay on the mats. You can change this around so much such as to incorperate freeze tag and mat tag and have the kids freeze when they get tagged and can join in when they get unfrozen.