Hiya Robert!
Welcome to planDisney! You are days away from a very magical time and I am very excited for you!
I'm not sure which Hilton you are staying in while in Celebration, FL but most local hotels tend to have a routine bus route to the Theme Parks in Walt Disney World Resort. Each hotel has its own specific timing and I see that you probably figured that out. Great! You are already doing fabulously. Walt Disney World Resort does not provide its own
transportation to other hotels other than Disney Resort hotels, Disney Springs, and theme parks. However, if you wanted, you could use a cab or drive your vehicle to any of the Theme Parks.
I have used rideshare vehicles many times to enter the Theme Parks as it is convenient and I hate driving on vacation. A cab or rideshare is convenient as it is available when you need a ride and you don't have to share it with another party. However, please know that when the Parks close there is a longer wait for a driver as many people are calling for them at the same time. I have sometimes had to wait 30 minutes for my rideshare to appear on busy evenings.
Parking your vehicle in the Parks is also a great idea.
Parking at the Theme Parks with Standard parking is $30 per day. (Prices are subject to change.) If you want to park a little closer to the Park entrance then you can pay a little more for Preferred parking at $45, $50, or $55 per day. (This price is seasonally determined.) Once you pay at one park for parking you can show the receipt to Cast Members so that you can park all day at any of the 4 theme parks. You do not have to pay again for that day so please Park Hop as many times as you like.
I hope that this was helpful and you have a wonderful time!
Happy Planning!
-Nimmy