I have a feeling that this section will be very popular. Not only is collecting all 100 packages an essential part to completing the game 100%. But it also gives you an awesome collection of weapons right outside your hideout on all islands.
However finding all 100 hidden packages is not an easy task and in most cases you will need a little help. So here is the locations of all 100 packages on each island with a picture to help you find it.
Hello again. Staunton #63 says that "just East" of the AMco building you find the store with a package (you have to bust the window). It's West. Face North on the HUD mini-map. Left is West, and Right is East. Duh.
Started playing GTA 3 for the first time a couple weeks ago (played GTA 4 first). Could be this has been cited before but it's easy to get on the roof of the Supa Sava building (#22). If you approach from the beach, you can see a wall on the right. Easy to climb the hill beside it to get on top, then run and jump the short gap onto the roof. Some stairs leading to the street are opposite the wall.
In #21, jumping the gap between buildings is much easier if you first grab the energy pill hidden in the trailers in front of the building. I did it while on foot and had just enough time to make it. Also, you can reposition a truck under the overhang so when you jump down, it's not as punishing a landing.
You can get # 92 before opening Shoreside.
Just get into the subway train and go to Francis Station in Shoreside. The exit will be locked so you cannot access Shoreside Vale but the package #92 sits IN the subway which IS accessible at the moment.
If you're going to collect all 100 hidden packages early in the game by using the tricks to get to each island early (before they're unlocked), you must learn how to fly the Dodo in order to get the hidden package on top of the elevator bridge. The other 99 are relatively easy to find.