Meet at alligator p's trailer @ vendor row.
The only problem i see w/ bikes leaving at noon is White Wash of the dunes.. Pain in the butt to read them and see for that matter. I would have to say Bikes 9-10am and buggys 2-3pm a morning and afternoon type thing... That gives the bikes time to get back (and if they have buggies as many do, get ready for the buggy ride), then have a bite to eat and off for the buggy ride.