Looking for a Mapping Plugin

Hi,

I’m looking for a mapping tool that will allow me to place a map on my wordpress site where viewers can post/pin locations and descriptions. My site is about summer camp, and I thought it would be fun for readers to be able to post their favorite summer camp locations on a map. I have found several map plugins, but I can’t find one that lets readers post markers on them. Does anybody know of anything like this that is available?

Thanks!