Grand Theft Auto: Vice City - The Definitive Edition

Text guide (en) with screenshots of package locations.

I recommend starting with this achievement and the medic.
You can get to the second island by dropping the ambulance into the water at the pier and jumping over the locked gate on the side. You can save on the 2nd island if you buy an apartment in a skyscraper, not far from the stadium. There is also a helicopter on the roof, which will make it easier to collect packages on tall buildings.
Rewards for collecting will make the game much easier