Is it possible to ride bicycles from the campground to the Buck Creek Rail Trail on the South end of the park?

Yes, you can ride from the campground to the Buck Creek rail trail and back. I figure you probably have your own bicycle but the camp ground does rent bicycles by the hour if needed. You can also ride from the parking lots Buck Creek State Park on Croft Road, and from the Buck Creek State Park beach parking.

Yes you can. Will be a great ride.

Yes you can

Yes

Yes. There are tons of bike trails and even the paved roads are bicycle accessible.

I believe so yes.