REWARDS - $2000
Catalina wants to rob a betting house and hands you some satchel charges. Go inside the shop and Catalina will take control of the crowd. Get in front of the red door and throw a satchel charge onto it, then move away and switch to the detonator in your inventory. Do the same thing to the safe inside.
Once you blast open the safe, CJ takes out the money and you'll be back outside. You now have cops on you (from 1-4 stars) and you have to return to Catalina's cabin. For now though, head to Dillimore to find a Pay-n-Spray to get rid of your Wanted level if you want. Whatever the case, head back to the cabin to finish the mission and earn $2000.