Disneyland! We often Park-Hop, so I'll give best hints for each Park....
USE DAS if any difficulties standing in line, of course I hope not. I can't remember if we have a thread already
We really only use FastPass for one attraction a day, so get one for whichever attraction you must see and has a long line...
Disneyland--get there as soon as you can after opening--EVERY DAY IT GETS BUSY! By lunchtime you will probaly go OMG...
We like to hit the lands in this order--Tomorrowland (Star Tours, Space Mountain, Buzz Lightyear, Finding Nemo Subs (rumor Subs will permanently close going round) then from Subs go to Small World, then thru Fantasyland go back to Hub (Walt's Statue area)
go thru Frontierland to Pirates of the Caribbean, Haunted Mansion, then to Big Thunder Mountain Railroad if it is open, then back to Adventureland to go on the Indiana Jones and the Forbidden Eye attraction. Indy has Single Rider, so if lines are long and you don't mind being separated, it will get you on and off quickly. The others named some very good dining options, but if you like unlimited BBQ, Go to Big Thunder Ranches' BBQ, not bad, all you can eat and entertainment of the Country Variety...sorry Zazu, I was raised on it! By this time you should be pooped, so you can go to Hotel to rest or leisurely take in Jungle Boat Cruise and Tiki Room, Shop for souvenirs and goodies and/or sit down for Parade and the Flag Retreat around Flagpole. Don't forget to see the Disney Gallery and Great Moments with Mr. Lincoln. The second day you can take it more slowly, ride a few attractions again and appreciate Fantasyland, Tom Sawyer's Island, Walk-Thru Sleeping Beauty Castle, Toon Town. You can plow in for the second show of Fantasmic as others are leaving the first show, the NOS rides are usually much lighter during show. Beautiful and exciting Show!
I know DCA less well, but a few things- RADIATOR SPRINGS RACERS!!!!!!! If you do Single Rider it gets you on A LOT faster, and you still might get to "race" each other, gesture and trash talk your friend's car
The other attractions are sweet but more kiddie geared....DO NOT MISS Radiator Springs at night you can hop there after WOC. Beautiful. DO NOT MISS the Aladdin Show, you will love this amazing production. Go Early and best seats are in front of the second area from stage--I think it's the mezzanine. From there go to Tower of Terror, the Little Mermaid Ride, Toy Story Midway Mania, Soarin'. You should definitely see the inside of the Grand Californian Hotel, you can go there from Soarin' and you will be able to go to Storyteller's or WhiteWater Snacks. As for World of Color, you can either wait in line early at Grizzly River Rapids Fastpass area for passes, or as far as I know go get some light snackboxes at Wine Country Trattoria to get your Pass, OR call ahead to 1-714-781-DINE and you can have dinner at Ariel's Grotto, the Trattoria, or Carthay Circle for your World of Color Dinner Packages. We went to the Trattoria recently and had a very good Filet Mignon dinner, although the service was a little impersonal from our waiter who made no friendly small talk that the others do--he's the only one we noticed like that, maybe he was tired or something. If you go early enough, many people do not get Fastpasses and just hang out at the bridge area where you don't need one. It all depends how much time, money and effort you want to put into watching it.
I also have left out the Animation Building in DCA, which I love for the lower-key Turtle Talk with Crush (Crush reminds me of our Hobie, he is a very wise Dude) Animation Academy, and many other beautiful Surprises. Don't Forget to see the very special Walt statue with Mickey near the Fountain in front of the Carthay Circle Restaurant.