I usually make a chart in Word and pencil in the days we have there and then add what I want to do each day. Then I am also able to pencil in meal reservation numbers and I have everything on one page.
Are you planning to visit all 4 Disney parks?
We usually have a quiet check-in day, and allocate one day per park. We try to spread out the park days so we aren't doing too many back-to-back days at the park (we have a 3 and 5 yr old - if you are 2 adults going, this won't be a big concern for you). We spend in between days at the pool, visiting Downtown Disney and shopping (I have lots of favorite U.S. stores that we HAVE to visit when we are in the U.S.).
It's important to map everything out early so that you can make your dining reservations. Once you know where you will be each day, go to allears.net and look at the dining options in each park and make your reservations early. Dining reservations are important! There is a good chance you will not get in anywhere if you don't reserve.
Let me know if you have any more questions - and have a fabulous trip!