I'm a WDW passholder and vet that, over the past two years, has become a gigantic DLR fan. I will be flying there in November for the 2nd year in a row to start a yearly Thanksgiving tradition. Here's my list:
1. Matterhorn- it is rough, but it's a piece of history and something you will miss walking in MK
2. Indiana Jones- DLR people say it was way better before, and probably was, but we love it
3. Fantasyland- We rope drop it one day every trip. You'll have like 6 rides in less than an hour and they're all old school Disney cool, Mr. Toad, Snow White, Pinocchio, Mr. Toad, Storybook Land, Casey Jr., Mr. Toad. We love DLR Fantasyland.
4. DLR Railroad- its old school, its cool and knowing Walt Disney was such a train fan makes it that much cooler
5. Cars Land- It's maybe the best land Disney has built that isn't in Tokyo
6. Avengers Campus- people dog on it, but my son loved it and I have some great memories here, even as a Tower of Terror fan, I really enjoyed Mission Breakout.
7. Incredicoaster- I'm a huge intamin fan, and a huge velocicoaster fan, seeing one of the earlier intamin launch coasters is pretty cool, bonus if you get a adorable snowman parfait afterwards.
8. Pixar Pal Around (aka Mickey's wheel of death)- very fun in the swinging cars, surprisingly so, and if you aren't there during a marine layer month, you will get great views of Los Angeles in the distance on the normal cars. The surrounding terrain is so much more beautiful than WDW with the mountains.
9. Monorail- it's much less utilitarian than WDW but it's a cool way to see all of DLR, and you get to enter Disneyland
10. Quick Service- there are some must do's like churros, pickles, bread bowls, corn dogs, jolly holiday (everything OMG) that should not be missed. The fried chicken at the plaza and Flo's V8 cafe is the best theme park chicken in the planet and everything a lucky fortune cookery is amazing. Don't sleep on the bread samples at Boudin Bakery.
11. Sit downs: Blue Bayou is cool because of the ambiance but the food really sucks, and the price is insulting for how bad the food is. Lamplight Lounge is pretty decent food and the ambiance is really cool. Carnation Cafe has a lot of history, and should probably be on your radar, even if the food is unremarkable.
12. Fantasmic- DLR has the better Fantasmic and it's not even close
There's probably more I'm not thinking of at the moment, but when I land in November this is pretty much the order I will think about things. We also always eat at least one time at In-N-Out because we don't have it and we love it.