fun?

Get a tank and see how many wanted stars you can get, whats the max like 6 I think lol

Sub mission like taxi driver.

Ah, now see here is the thing that I have been trying to prove to people. No matter how good a Grand Theft Auto game is, they will eventually get boring. Anyway, you could go mess with a bunch of gangs and cause a big gang war, thats always fun. Another thing you could do is sub missions like begin a taxi driver, police man, emergency medic, and all kinds of other stuff. If you get bored of that then you could simply replay the storyline.

Hope this helps.

Just look up some cheat codes, like spawning tanks and stuff. Get a whole bunch of cars next to each other and blow them up like dominoes with a
Rocket launcher or something. Grand Theft Auto holds a lot of possibilities.

You could go mess around the cops or grab a bike and jump from building to building.

Just rule the city.. Or to some side missions..

Boring with gta?!?!?
4 words...
Sniper, rifle, roof, top.

Ok, I know it sounds wierd but it can be fun. Soemtimes I set up like different scenarios. One time I ran around and got all six wanted stars then got arrrested. Then I got my guns back and waited til like 6 am on the game and got in a cop car and pretended that I was a cop. I'd drive and kill random people or stop cars that were driving bad. You can also go to a roof and sniper to see how long it takes to get killed or arrested. I also stood in the middle of the street where the rhino tank spawns when you use the cheat and it landed on top of me. I couldn't get out. It was a glitch. I used the rpg to try to blow it up and the tank trapped me to where I couldn't shoot or move and my health kept decreasing. I kept using the health and armor cheat and the rhino cheat. I ended up getting like five stars because the tanks were blowing up the cop cars when they spawned. The empire missions are fun too. Get all the empire buildings and missions.