Costa del Sol's reputation is better than its reality. This stretch of highway southeast of San Salvador, with the Pacific on one side and a beautiful bay on the other, is known as the beach getaway for El Salvador's wealthy elite. If you're invited to one of the locals' large beach houses, no doubt you'll have a blast. However, for the average traveler, the region is hard to get a handle on. Huge walls block the beach from the region's homes, and Costa del Sol offers no central area of activity. There's no charming cluster of interesting restaurants or shops, and most visitors usually check into their hotel, hang out on their hotel beach, and eat in their hotel restaurant during their stay.
All that said, Costa del Sol can be an excellent beach day trip, as it's only 25 minutes from the airport and 45 minutes from San Salvador, with public beach access at the local tourist center. Costa del Sol's beaches are also bigger, sandier, and, when the waters are calm, better for swimming than the rockier beaches to the west. The area even offers a gorgeous bay with an international cadre of yachts bobbing in its protected waters, where regular folks can rent some watercraft. It's definitely possible to have a great time here, especially if you're looking for a packaged resort experience.