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I hope there will be another GTA soon!!!
Anyway, you need to do all of these things:
Find all 100 hidden packages.
Do all the unique jumps.
Do all taxi, vigilante, ambulance, firetruck, Mr Whoopy and Brown Thunder missions.
Do all the street racing missions.
Do all the events in the colluseum.(Dirtbike, Hotring etc.)
And a whole lot more, but all of that should keep you busy for a while.
I hope there will be another GTA soon!!!