Try staying at one of the 3 official Disney resorts if not a hotel in the DLR resort area. I'm not sure if DLR still offers a dining plan, but I remember hearing that it was not worth it. Also, if you end up getting a 3-day ticket to the parks, you'll end up getting
2 more days free according to
this special I found when looking for info on my future DLR trip - so I guess that will tempt you to stick to the parks for the entire vacation, although you still should probably take a break and drive to LA or San Diego. If you do stick to the parks for the whole vacation, though, a rental car might not be necessary so maybe it might be cheaper? Anaheim GardenWalk complex with shops, restaurants, and more is opening this summer which will provide more things to do in the area within walking distance.