Just so that everyone is clear on where to meet, I thought over by the Picnic Center would be a good place for us to gather and picnic. If you look at the JICP map, it's kind of smack dab in the middle. After you enter the park, follow the road straight around the bend and past the first stop sign. Up ahead on the right will be a large parking area for the off-leash area. Just past this on the left side is the Picnic Center. There's a kid's playground and a building where the bathrooms and some vending machines are. For Google Earth saavy users, it's at roughly 32.733°N and 79.99°W, although it won't help much as there's a big cloud right over the aerial photo of the park.
I'll try to get there a little early and put some signs up.