you can unlock the ability to swim forever in vcs,to do it,you need to have the 2nd island unlocked.There is a side-mission called beach patrol,and in this you have to do 15 levels of taking paramedics to nearly dead people on the beach,or you go around killing people on sanchez's,to start these beach patrol missions,you need to find A RED BF INJECTION on the beach,it is a little tough to find sometimes,it's next to one of the little huts that are littered across the beach,dont use a helicopter to find it though,the pop-in will annoy the crap out of you,instead,grab a quad and go down the beach 'til you find it,place a target on it when you find it to not have to search for it again,the missions are easy,bring a submachine gun with you to kill those bikers,also,the side-missions have checkpoints,every 5 levels you do will have a checkpoint,so you can save your game,load it up some other time and continue from where you left off,hope i have been helpful to anyone that has read this.
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