We did DL last summer. First, make sure you sign up at MouseSavers to see what deals Mary has cut for her members. I got a wonderful room at HoJo's for $65 a night. Had I booked a month earlier, it would have be $10 less than that! I loved HoJo's because it's gift shop carries milk, yogurt, cheese, fresh fruit, muffins, etc. Of course, it's gift shop prices, but still much less than the parks. I took along individual boxes of cereal...you could take one big box, even, as the gift shop sells individual bowls and sppons! It saved us a ton of money. The room also had a free fridge, so we filled up our water bottles there and had chilled water to take along for free.
There is a McDonalds and a Denny's between there and DLR. Try going to the Anaheim Visitors Bureau website to see if they have coupons. I got 20% off the total order for McDonalds, which brought the price down to what our McDonalds at home charges. Denny's had out a sign about kid's eating free...I'm not sure which night, but I'm sure you could find that info.
We usually only ate one meal per day in the parks, which was a big savings.
3 days is enough if you are spending full days, and don't mind if you only get to do some of your favorites one time. Be sure to plan around parades and shows if they're important to you.
If you have time, be sure to leave a few hours to wander around Downtown Disney. We had lunch at the ESPN Zone...my kids loved it and the game room upstairs (they got their game fix, lol!) I don't know if you still get points on the Park Hoppers, but between those and the ones you get if you sign up for the ESPN Zone membership, they played for free for nearly 2 hours...and we left with points still on our cards!
If you have boys, be sure to go to the
Lego Store there. Plan to budget so they can fill a container with the cool pieces they carry; things you can't buy separately anywhere except at the Lego Store.
I wish we'd had more time to just wander down there, but, alas....
Personally, there isn't anything else in the LA area that called out to me. I did all the touristy stuff back in the 70's, and had no wish to go back to any of those places. Folks who go more often should have some great suggestions, tho!
Have fun on your trip!