Hi there,
I live in Orlando. The general guidline for restaurants is 15-20%.
I don't take taxis, since I live here and have a car. However, I would think it would be the same: 15-20% at your discretion.
If you are staying in a hotel, you can throw housekeeping a couple of dollars a day if you feel so inclined.
If someone is carrying your bag (bus driver, sky cap at airport, bellman at hotel), you can give them $1-2 a bag.
Have fun!