Last summer we took a trip out to California to see Mickey. We stayed here:
Anaheim Resort RV Park
It was a "concrete Park", but lots of trees around. They have a shuttle straight in to Dizzyland. We all hopped on to the shuttle first thing in the morning. When the young'uns got tired, momma took them back to the trailer (on the shuttle). After the nap, they all came back and we finished the day together. It was close enough to see the fireworks from our trailer.
They also have a pool and clean laundry facilities.
I'd stay there again if I were going to Dizzyland.