Oceanside is among the region's best places to escape the hustle and bustle of the crowded cities. The city is located just south of Camp Pendleton, the busiest military base in the United States. Considered the gateway city between metropolitan San Diego and Los Angeles, the near-perfect climate invites visitors to revel and relax at the 3.5 miles of white sandy beaches Oceanside, CA offers. It’s known for its marina and shops, trendy new restaurants and coffee shops and home to the California surf museum and Oceanside museum of art.