I live in Orlando, so here's a few things to be prepared for.
Traffic - Early am and pm rush hour traffic is a reality and you should plan for it, especially if you are going anywhere near I-4

. If you miss your turn please don't cut across 3 lanes of traffic to make your exit.. just go down and turn around. Use your GPS or other devices so that you are prepared to get on the road and know where you are going.
Parking - On that note parking in the parks takes time, and there is someone to direct you to your spot ( Parking is around 17.00 if it did not go up when ticket prices did so I would check and budget for this) Please follow their directions and park where they point, don't be "one of those people" who think that all that direction is for everyone else.

If you are going to park hop, park your car in the lot where you will be finishing your day. This will save you some steps at the end of a long day.
Research your offsite resort - My friends got all kind of surprises, they found out that parking at there offsite resort was 20.00 a day ( 140.00 for the week), another surprise that there was a daily charge for Wi-Fi was 10.00 a day( 70.00 for the week) and the 2 biggest surprise was that cleaning of the unit was not included with the price listed on line with 4 kids daily cleaning is necessary so that was 200.00 for the week, nor was the resort fee that was added to the bill at check out, which was about 50.00( 350.00 for the week) extra dollars a day to the bill. So 140 + 70 + 200 +350 = 760.00 extra that they spent. She said with all that and the rental car and gas they could have done 2 moderates room and used magical express and got free dinning, for what the ended up paying. I am not trying to change your mind about saying off site, I am just saying check the fine print before you commit

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Restaurant - Lots of good places to grab something to eat, check out groupon or other sites for coupon and deals before you come. Sweet Tomatoes normally has some kind of good coupons, the last one I can think of was 4 for 25.00 which included a drink. Olive Garden and O' Charley's are 2 of our fav's for take out. Big portions that are easily split up.
Check out DTD restaurants Earl of Sandwich has really good sandwiches for a great price. You might want to check out some of the on-site resort so head over at meal time, and enjoy checking everything out, and taking a break from the parks, and getting some different offerings than in the parks. POFQ and POR have really good counter services options as well as the Poly.