As with most things in Yosemite, bigger is better. Upper Pines Campground is no exception, boasting 240 campsites. It very well may be the most popular campground in Yosemite Valley, due, in part, to the views of surrounding icons, like El Capitan and Half Dome. Each site features a fire ring, food locker, and picnic table, and costs $26 per night. Upper Pines gets crowded in a hurry, so go in with the knowledge that you'll be nestled up next to your neighbor, with very little privacy (I mean...it is Yosemite Valley after all). That being said, the central location and convenience of Upper Pines makes it a no-brainer when visiting Yosemite.
Word on the street (or in the park)—the best campsites are: 8, 9, 10, 21, 46, 62, 69, 99, 108, 137, 156, 172, 179, 182, 197, 202, 204, 206, 207, 208, 210, 211, 216, 220, 222, 226, 228, 230, 238, 239, 240