If you are just staying two days, then the benefits of staying onsite probably wouldn't be as great.
You definately need to park hop--the distance between DCA and DL is like walking from World Showcase to Future World.
You definately want to ride Indy. And Pirates, because it is way cooler than the one in WDW. And Alice and Toady in Fantasyland.
You want to take GRR in DCA...way, way better than Kali rapids in AK.
If I were there for two nights, I would spring for the Fantasmic Dessert Package...you can reserve one month out from Disney Dining...see WOC on your other night...
The Aladdin show in DTD is very very good as well.
Food is not a big deal at DL. Carnation Cafe is fun because it is right on Mainstreet, you eat outside, and it is not real expensive. You can make a reservation with Disney Dining. A lot of people like Cafe Orleans, and of course if you want to spend a wad on a quintessential DL only dining experience, there is Blue Bayou, which is inside Pirates.
Have a blast!!!!