Time Travel

How good it would have been had time travel been possible. I would love to travel into the future and see whats in store for me. And if I don't like it, travel back, make changes accordingly.
I don't know about the later but I am certainly due for some time travel. From 12 hours behind to 12 hours ahead!! May be beat the rotation speed of the earth and jump a day while doing so. Wonderful.....I better read The Hitchhiker's Guide To the Galaxy.