I assume you mean Glendo State Park in Wyoming
Here's a link for general information http://www.wyomingtourism.org/overview/Glendo-State-Park/3102
This link describes camping areas towards the bottom of the page http://www.stateparks.com/glendo.html
Lots of folks like camping at Sandy Beach. Likely it will be full this weekend.
I would call the park for recommendation on where to camp this weekend. I've found them to be very helpful.