downtown district
the army base
you unlock all weapons
If your asking where to find a bus, there is one next to the interglobal film studio space scene on prawn island.
The safe is downstairs in the cellar and the code is 8423
in the boat that's near your safehouse
You cant.
it is a mod.
in gta lcs you can't swim but in gta vcs you can swim and in gta lcs the missions are quite easier but in gta vcs there are more challenging missions and harder in gta vcs the weapons are so cool.
Try the airport on the first island after unlocking the second island.
Around $20.
There is no jetpack cheat for gta vcs, in fact, its impossible to get a jetpack on gta vcs =D