If you are playing on the PC version, you can download free mods that instantly unlock the entire map.
A massive open tarmac perfect for stunt driving and stealing early helicopters like the Maverick. gta vice city unlock map free
If you prefer to unlock the map as intended, you must complete specific early-game missions: If you are playing on the PC version,
Collect all 100 Hidden Packages across the whole city. gta vice city unlock map free
Drive to the locked gate at the Vice City International Airport or the film studio.