Renting a vehicle while at WDW is always an interesting proposition. IF YOU STAY ONSITE, Disney offers Disney's Magical Express, a bus service that will take you from MCO to your resort, then back to MCO at the end of your vacation. They also have a nifty luggage service associated with DME. If your flight arrives at MCO before 10pm, all you have to do is attach the special luggage tags that DME sends you. You check your bags at your home airport and never touch them again. Voila! Like magic, they appear in your hotel room! Sweet! You also don't need to rent a car, as you can use the Disney bus service to get from your onsite resort to and from the parks. Sounds amazing, right? Well...
While we love DME, we find Disney busses to be a huge hassle. You wait in line for the bus, which is usually packed full of people, pressed up against each other, and you stand for the ride. The same thing happens at the end of the day, only now you've been on your feet for 6-12 hours, it's past everyone's bedtime, your feet are killing you, the kids are exhausted, and you still have to wait for the bus. In August, we have waited up to 90 minutes to get a bus back to POP after MK closing. Yes, this is extreme, but waiting 20-30 mins is NOT. Also, you can't go from a resort to a resort with Disney busses... you have to go via a theme park. This means, if you are at POP for an afternoon break and have dinner ressies at Boma, you have to get a bus from POP to any theme park, get off the bus, wait in line for a bus to AKL, and then go to Boma. We find it highly inconvenient, and time consuming.. and at Disney, time = money!! I don't want to get a bus discussion started... this is just my family's experience with the Disney bus system, YMMV.
If you are staying offsite and driving a personal vehicle to the parks, it's $14 a day, per car, to park. One parking permit works for the whole day, even if you park hop, but you still need to figure in the $14 a day. Even when we stay onsite, we rent a car for the convenience and time-savings (and if you are an onsite resort guest, parking is free!). Car rental prices are all over the place, and in addition, there are membership codes, rates, and coupons to bring the price down. Go to Mary Waring's site, mousesavers.com, for the best explanation on how this works, how to do it, and for the best list of discount codes available.
WHEN YOU ARE LOOKING FOR A CAR TO RENT... prices change in the blink of an eye, so if you find a deal you can live with, BOOK IT. You can always cancel when you find a better deal. Check rates frequently-daily-hourly... seriously, rates change at the drop of a hat. Usually what I do is check orbitz.com first, to see which agencies have the cheapest rates. Then I play with codes and coupons for a couple of companies, to see how low a rate I can get. When I find something OK, I book it. I then monitor orbitz a couple of times a day to see if general prices have dropped. If so, I go back into the specific agency websites and fiddle with codes and coupons to see if I can get a better rate than the one I already have. This worked well for last week's trip... our 4 day midsize rental started out at $328, but I ended up paying $109 by monitoring rates and using codes/coupons!
Don't get sucked into paying rental company insurance fees! Almost all personal car insurance policies will cover rental cars, and if you use a credit card with rental insurance coverage, this will also provide adequate insurance. REntal car agency insurance fees are exorbitant, and unnecessary if you have coverage on your own policies. ALSO... don't pre-buy that tank of gas so you don't have to return the car full. You can easily fill your tank at any gas station around Disney.. as long as you make sure to really fill the tank, you'll have enough gas to get to MCO and still have the tank register "F".
Don't get sucked into purchasing ANYTHING suggested at the rental car desk when you are picking up your car, whether it's insurance, gas, an upgrade, GPS, etc. Your price will skyrocket, and if it makes a change to your original reservation, those prices might not be available, your codes or coupons might not apply, etc. I always make sure i have a copy of the rental reservation that clearly lists costs, total rental price, etc., along with a copy of my personal auto insurance card (although I've never been asked for it...also figure it's a good thing to have on hand in case "something" happens while I am driving).
SO... after listing all this scary stuff, let me say that I LOVE playing the car rental game. I LOVE seeing how much money I can keep in my pocket instead of giving it to the agencies. It's really easier than it sounds here!!