Potrero Del Sol is a great concrete park in the middle of SF. The bowl section has a deep (vert) bowl, a medium bowl, and two smaller bowls. The transitions are super smooth, and there are tons of lines. The street section has a wall of banks and quarter pipes on one end, including a super fun tall, steep bank. The other end of the street side has some mellow banks, rails, etc.

All in all, this is a great park with something for everyone. There are lights, but the signs say it closes at 9pm. This place can get crowded (especially the street area), so it's best to come early in the morning if you can. The gates open at 8am.