Bikes get preferred parking at B C & D lots, then the other ones close to the track. Get there early and they even park you on the shoulder along B & D lot access roads. The late arrivals find spots in between cars in the other lots. http://circuitoftheamericas.com/visit/venue-maps

F-lot is pretty easy to access the track. We parked a car there and walked to the main gate, no biggie.

If you have a Ducati you can park in Ducati Island inside the venue.

Vendor booths and track food is widely available outside of the paddock in the other infield areas (near T13) for example