Maymont is a really great park! It's free but they do ask for donations because it's non profit but they do have some amazing places to take photos. We usually have the meet up in the Japanese gardens and from all the meet ups I've been to we haven't had a problem with the staff there.
I'll be attending NekoCon 15 2012
Friday: Medusa (Soul Eater)
Saturday: North Italy (Hetalia)
Sunday: Zoey (Left 4 Dead)