Go-Kart
Get a helicopter and fly towards the dam in the desert. Then, fly northeast and find the location with a couple of shacks on top of a tall rock. In one of the shacks is a Go-Kart. The other one has a parachute. Additionally, go to Tierra Robada in the desert. You can find a Go-Kart in one of the two-story brick buildings. It is north of the city, and there is a stair set in the front of the building with an open door. Go inside and you will find a Go-Kart in the back of the building when you walk in. Drive it out of the window and take it for a spin. Enter the Go Go Cart race by Wang Cars and the Pay N' Spray. As soon as the race starts, take it to your nearest safe house. If the garage is full, take one of the cars out and put the Go-Kart in. Run away and make sure that the door closes or you will lose it. After you complete Madd Dogg's Strand mission, a Go-Kart will appear on the east side of the house. Go to Angel Pine. Enter the caravan site. Behind one will be a Go-Kart.