I would take care of my family and friends. And purchase alot of land, then build an ass load of housing, and let my friends live there, and then have kids, and play with them all say, like throw base balls at my son or something, then tackle him, and say that we were playing foot ball. Or maybe I'd suplex him off the roof of our ten story mansion, but since I have a limitless supply of money, I had secretly employed a vast staff of genius scientist to research immortality, so my son and I survived the fall, we would play chicken in F250s, and rob banks as a leisure sport. Then I'd resettle near my friends, only to find out all this has scarred my son's mind, and he has been slaughtering innocent non-immortal (puny mortal!) and that I am the only one able to defeat him, so I cut off his head, and in a very sad ending I am on the roof top of an unfinished structure, slumped next to my sons corpse and holding his head crying.
On a serious note, and this is gonna sound like I am copying another guy, I'd like to actually be a dad.