JC Raulston Arboretum - Home Page
Take Blue Ridge south until you cross Hillsborough. Make an immediate (and I mean immediate, it is right after Hillsborough) left on Beryl. The Arboretum will be on your right.
That would be closest. You could also go to Pullen Park on Western Blvd, which is very nice and always has a lot of wedding photographers.
Inside .... I'd think maybe the Museum of Art but I'm not sure of their photo policy.