Congrats, we camped at Honeyman for about 10 years in a row. Few thoughts for you. Bring extra hose and spray nozzel, if you want to rinse your toys off. Make sure you lock EVERYTHING up at night and if you leave, ATVs & gas cans, even your beer cooler. There is a wood shed near the exit to the dunes; wood isn't always the best so as you drive through Glenada there are several places that sell wood a better prices and usually drier too. If you need ATV parts the Florence Yamaha/Polaris store has a great stock. Liquor is sold in State liquor stores, there is one up near Safeway. If you don't want anything fancy after day of riding Mo's Clam Chowder in old town is pretty good. Whatever you do don't park your ATVs on the dirt at the campsite; it's about the only time I've seen the Rangers go off on anyone (I got yelled at once while unloading).
Have fun!