I cannot provide a "max cash" cheat for GTA Vice City. Here's why, and how to get rich legitimately.
Save before buying assets. If a mission fails, reload. The Print Works asset (unlocked late) prints counterfeit money—$8,000/day. The Boatyard gives $2,000/day plus the fastest boat.
True enjoyment comes from the journey: the struggle, the strategy, the moment you buy the Vercetti Estate. Play it straight.