Flying would be cool because we would be like superman but it would be dangerous. If everyone could fly we would always run into each other. Also there would be no traffic laws and stuff, so we wouldn't know want to do. There would be no lanes so everyone would go everywhere.
If everyone was immortal it would suck. No one would ever die so we would have to go to mars or something. Also your animals would always die and you would still be alive, that would be so bad.