Collect the indicated number of hidden packages to get a reward at the specified location:
10 hidden packages: Body Armor at Ocean View Hotel and Starfish Island Mansion.
20 hidden packages: Chainsaw at Ocean View Hotel and Starfish Island Mansion.
30 hidden packages: Python at Ocean View Hotel and Starfish Island Mansion.
40 hidden packages: Flame thrower at Ocean View Hotel and Starfish Island Mansion.
50 hidden packages: Laser Scope Sniper Rifle at Ocean View Hotel and Starfish Island Mansion.
60 hidden packages: Minigun at Ocean View Hotel and Starfish Island Mansion.
70 hidden packages: Rocket Launcher at Ocean View Hotel and Starfish Island Mansion.
80 hidden packages: Sea Sparrow at Starfish Island Mansion's Helipad.
90 hidden packages: Rhino at Fort Baxter Air Base.
100 hidden packages: Ultimate Secret Vehicle at Fort Baxter Air Base. You can use this vehicle to do Brown Thunder vigilante missions.