Cockfights are one of the easiest ways to get a lot of money, but the only one that allows you to bet high money is the one in Kennedy Town. This one has a max bet of $100,000, meaning it's possible to double your money if you win. SAVE YOUR GAME before betting and bet on the rooster with the most wins. If you don't win, then reload your save and try again.
HEALTH SHRINES LOCATIONS
After finishing the Amanda mission, you have an opportunity to take Amanda out on a date. Complete this short mission and all Health Shrines will now appear on your map, when pressing the button for Collectibles. Also, whenever you're close to one while playing the game, it will appear on your minimap.
JADE STATUES LOCATIONS
After finishing the Club Bam Bam mission, you can call Tiffany after to take her out on a date. She asks to go to a karaoke bar and if you score 90% or better on the song, all Jade Statues will be unlocked on your map.
After finishing the Important Visitors mission, you can call Ilyana afterwards to go on a date with her. Complete this side mission to unlock the locations of all Lockboxes on your map.
SPY CAMERAS LOCATIONS
After completing the Listening In mission, you will be able to go on a date with No Ping afterwards. Finishing this side mission will unlock the locations of all Spy Cameras on your map.
JUST CAUSE 2 RICO'S OUTFIT
If you have a save file for Just Cause 2 on your system, Rico's outfit will be in Wei's closet. This outfit allows you to hijack vehicles from farther away.