maxine,
are you talking about next may or just a visit to gulf this summer? the Primitive sites at Gulf are long the main road set amongst small trees and behind them are sites 296 to 311. I believe they have no utilities at all and because of the brush and trees probably don't get much breeze. So yeah the Primitives are not near our general cluster but a tent can go on the grass of any campsite. Note in the reservation tool when you pick an available site number and it shows the details for that site, scroll to the bottom and they have one (1) picture you can click on that will show a little bigger the site. I'd say any on Sumac can take a tent on the grass off to the side.
I recall seeing many bikes available at the Gulf camp store in the pavilion shared with the laundry room (nice) across from the pool. IIRC they had a little license plate under the seat that said they belong to Beach Bike Rentals in Orange Beach
http://beachbikerentalsorangebeach.com/ . On their website it says $25/day or $85/week for a cruiser so I would expect something similar for those of theirs at the store.
Bama Ed