The bike shops near Seagrove mostly cater to beach cruiser rental crowd. IIRC the closest roadie shop is in Miramar. There used to be one at Blue Mtn but my last time by it had converted to the cruiser rental business model. Riding through Seaside / Seagrove, etc., you might find it easiest to ride on the road because of the driveway issue. Once you get out of the cottage areas, though, the paths work OK. Particularly between Seagrove towards Rosemary where for a stretch 30A stupidly is one lane each side with a raised median and gutters - absolutely no room for car to get around you.
Some of my most enjoyable rides have been with the Emerald Coast Cycling Club - their rides are on the N side of the Bay - lower traffic and even some rollers.
Don't be afraid of riding 98 at the E end of 30A across the bridge into Panama City, then veering onto the beach road. To me it's less harrowing than the W terminus of 30A taking 98 towards Destin / Sandestin area - (but I do that as well)
Last edited by Ex Pres; 09-17-13 at 08:27 AM.