You have to make a new profile in the new minecraft launcher, and under "use version:" select 1.5.2 or whatever version you want to use. Then you just play on that profile you just made, and voila, 1.5.2.
San Andreas is mostly my fav because it was the first GTA where youre not freaking fatally allergic to water. Oh, and helicopters were better and police bikes were amazing.
Liberty City is my #2 because it had the best cars in all of the GTA's at the time. I lost track of GTA after the 4th ruined everything, so idk if there's better cars in the newer games. But I love cars and liberty city had cars soo..