I'd probably spend a good few years making sure I had electricity, food and clean water for the rest of my life.
After that, I'd find a awesome house and move in. Then I'd take everything I've ever wanted and have a bit of fun. I wouldn't fancy piloting a plane, so I'd find a large boat, then cruise over to Mr Abramovich's yacht and take that. Then visit a few places around the world, take in some sites and so on.
If there were any animals left, I'd make sure to have as many dogs as I could, they'll be my only company. I'd probably try to get a bear tamed too for protection against other animals that may attack me. Not sure how he's be on the boat though.