There is a whole lot to do with your money in Grand Theft Auto 5, but unless you're smart about spending and investing your cash, you can end up running out pretty quickly. If you're looking for a better way to earn cash without doing it the legit way, you may be interested in this glitch which can allow you to buy ANY property in the game for free, as long as you have more money than the cost of the property.
Warning: Some users have reported that this glitch has broken their mission files and have said that they cannot continue on with missions. Do this glitch on a new save or wait to complete the story first.
This glitch is actually fairly simple to reproduce. All you need to do is make sure you have the cash for the property in the first place. (in the case of the more expensive properties like the golf course, this may take time to earn.) Once you have the cash, go to buy the property like you normally would, however as soon as the quick cutscene starts, pause the game immediately and choose a mission to replay.
To save time, pick a quick and easy mission. Once you've completed the mission, you will appear in front of the property you bought, and you will own it and still have the money left over from before.
One more tip: Consider saving the game before buying a property. This way if you fail to do the glitch, you don't have to waste your hard earned money and can just load up the save before you tried to buy the property.