Most motels are on US 85 (Grand Ave.), the main north-south highway through downtown Las Vegas. (An exception is the Plaza Hotel.)
There's plenty of camping available in and around Las Vegas. I recommend the Las Vegas KOA (tel. 800/562-3423 or 505/454-0180; www.koa.com), which has 65 sites, 15 with full hookups, 26 with water and electricity. Laundry, grocery, ice, and recreational facilities (including a pool) are available, as is a large gift shop. Seasonal cookouts are offered. From I-25, go 1 block southeast on US 84, and then half a mile southwest on Frontage Road (also called Sheridan Rd.).
Also in Las Vegas is Vegas RV Park (tel. 505/425-5640), which offers 40 sites, 33 with full hookups, and cable TV availability. It's located at 504 Harris Rd. in Las Vegas.
If you'd rather camp at a state park, try Storrie Lake State Park (tel. 505/425-7278), which offers 20 sites with electricity, 23 sites without it, and primitive camping in an open area close to the lake. Developed sites have water, picnic tables, and grills, and a visitor center is nearby.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.