4. Base Jumping
This may be an unpopular opinion, but Base Jumping was a really boring activity in GTA IV: The Ballad of Gay Tony for me. The first few were fine, but completing them all was a hassle, especially the most difficult ones. To me, it was just a great way to experience Liberty City from the sky and the rush of jumping from a tall building was initially breathtaking. Now that I've experienced it in a GTA, I wouldn't want it to return for the next instalment. Oh, but keep the parachute. We can all still have plenty of fun using that.