I go to the bank before I leave and get around 30 $1 bills. I keep them in a separate envelope, so when I need to get a tip, I don't have to sort through other bills in my wallet and possibly drop/lose other money. I usually don't use $30, but I like to be prepared just in case.
When you pack, pack a little bit of everyone's clothes in each suitcase (instead of 1 bag w/ all of your stuff, 1 bag w/ all dh stuff, etc.). That way if a bag gets lost or misplaced, that person will still have some clothes.
Money for tolls after you get to FL. I don't know how much, hopefully someone can pop in w/ that info. But I remember one of the tolls being exact change?
Quarters & pennies for pressed pennies. I keep ours in a mini M&M tube...stack 2 quarters, 1 penny; 2 quarters, 1 penny. etc.
Copies of insurance cards & "in case if emergency, please contact"...I make up a little notecard and keep it in my wallet by my i.d. and one in dd's w/ my doctor, my mom's phone, etc. If for some reason I'm unconscious, they will have the info. I know this is overplanning, but it is easy and takes up no space
If you have your park tickets already, copies of the backs of them.
Is this your first time? If so, don't forget to actually stop and have fun while you're running around trying to get in all of the fun

Sometimes people are so focused on getting from A to B they miss all the little neat things in between.