We are going to host my son's third birthday party in our apartment. I think we're just going to make it a big play date rather than hiring some entertainment. We will probably have less than 10 kids and about 20 adults. (It was supposed to be about 5-6 kids but somehow the list grew...!)

Anyway, I was thinking about buying a couple of these for the kids to color:

http://www.orientaltrading.com/color-your-own-train-box-costume-a2-13747499.fltr?Ntt=train

But am I crazy to let that many kids have access to markers in my living room? I will be pissed if someone colors the couch or the wall. My son knows that markers stay at the table when we use them.

Any suggestions for how to manage this, or should I just skip it?