Invisibility is for pervs... which I'm not condoning, lol. Time travel does sound cool but in reality, you scare the crap out of a lot of people if you showed up in their time period looking and talking like someone from the 21st century. Flying is what I'd want to do. If not that, instant teleportation to any place in the world would be awesome too. I guess anything that saves the hassle of flying in a plane for me...
I would be stupendous man. I would have the power to make women miserable yet insist on keeping me at the same time.
A time traveler would only alter time for an alternate timeline, not his own. So he would make another version of himself wealthy, but he would remain a broke-ass time-cheater.
I'd have to go with enhanced reflexes and agility... becomes more pronounced in times of need due to increased adrenaline... at its peak it is basically precognition... basically I'd make Bruce Lee look like a statue. Of course, I'd need to train up a little bit before I could kick some major ass. Super hero fantasy are often used to compensate for real life inadequacies... Makes sense for me, as I am a clutz.
... but not land or business ownership. Money would have to be in the form of gold or some other precious metal... Currency would be seen as counterfeit as it would possible contain bills with duplicate numbers. A large influx of any commodity brought along would cause fluctuations in the value of said commodity.
Or they can travel to the future and steal a sports almanac, then return to their own time and place their bets accordingly. Unless this has been done already.