GTA V: Stock Locations: Post Op

Sometimes Their competitor's trucks are there as well.

Post Op is a postal delivery company. Their main competitor is Go Postal. Their delivery office is located on the Elysian Island.

GTA V: Stock Locations: Cluckin Bell

A lot of dead chickens want revenge

On way to make money in the stock market is to blow up the competition. If you want Cluckin Bell CLK stock to go down and Taco Bomb TBO to go up. Blow up and create general mayhem at their farm factory. It won't be much but it is will be enough to consider. 

GTA V: Random Events

Grand Theft Auto 5 has many random events throughout the map. Some funny, some profitable, all entertaining. I am honestly not sure if you need to be certain people to get the certain events but I have marked them down as such just in case. Trevor also has a unique issue of looking for hitchhikers that he can then send to the altruist cult for profit instead of their intended destination.

It is quite possible to get these events with different people but these are the ones that I found them with.

Trevor:
RV Sex Interruption
Large White Girl Robbed
Chase Thieves Country 2
Griff the Fat Washington Patriot

Trevor Hitchhikers:
Hitch Lift 3
Crash Rescue (New Heist Driver)
Burial ($60,000)
Hitch Lift 2 (Ursula New Contact)

Michael:
Bad Bikers

Franklin:
Deal Gone Wrong

Rogue Altruists 
Domestic  (New Golf Partner)

GTA V: Interesting Location: Underwater Base

What they heck were they making down there?

With all the scum and villany, you should have figured at least one of them would try and make an underwater base. Well it looks like someone tried and failed. There is a large incomplete constructions site, with a large cylinder that you can go inside. There is nothing inside that I could find but there is a lot of other stuff lying around nearby.

What is there:
-MG
-Combat Shotgun
-Grenade
-Health Pack
-$25000 case (near the tube entrance on top)
-Assault Rifle
-Full Armor
-Grenade Laucher

GTA V: Interesting Location: Crashed Cargo Plane

There are a few bad pilots out there... other than me. 

It helps if you have the submarine as you can just get out of it and directly into some scuba gear but this location has a crashed plane that looks like it has been here a little while.

You can find:
-RPG
-SMG
-$12,000 case 

GTA V: Random Event: Large White Girl Robbed

Won't they ever learn?

As Trevor moving south, a large woman wearing white yells out that she has been robbed at the ATM machine. You see a guy running away with a gun. You run him over and get $500. If you are nice, you give the money back to the woman and end up with only $50. 

GTA V: Random Event: Buy Gone Bad

Was it really worth $25,000?

As Franklin, you come across several wounded and dead bodies in the area. One of the guys next to the car with the horn tells you they took the money over the side. Go down the hill and there is another injured guy saying don't take the case. If you do, you immediately get $25,000 and everyone around you croaks.

After about 30 seconds of driving away, two trucks start shooting at you telling you to give them back the case. Not sure how to do it so I just shot them all and kept my winnings.