Hey, im not sure if anyone has a cheat for this but i discovered something. I was using the rise or lower water level cheat in LCS, and i found a glitch or something. I put the water level from 40 to 50 and this happened. It looks like the old school gta game style!
Old School GTA:

LCS:


How to do this:
1. Stand outside. Somewhere not too high. Just on the road or something like that.
2. Use the water level cheat and put it to somewhere from 40 - 50. Feel free to go higher and experiment with it.
3. Turn the cheat off by pressing X once the water level has risen. You will see the water dissapear and it will be normal again.
4. Turn the cheat back on.
5. Voila! Have Fun!