My husband and I went to WDW WAY back in October 1977 when it was only the Magic Kingdom, 26 years ago! Even though we didn't stay onsite (wanted to stay at the Poly but money was very tight back then), the offsite hotel we stayed at was very nice to us; champagne, free room service breakfast one day, chocolates and fruit.
As for the MK, our favorite memory surrounds the Seven Dwarfs. Remember, this is way back when characters could be found anywhere at anytime in the park, just walking around. My husband I were just walking when another guest yelled at us to turn around. And there they were! The Seven Dwarfs all right in a row behind us, hopping and skipping. It was the most awesome thing...we still tell our kids (14 and 10 and many,many visits to WDW under their belts) about it.
You will have the most wonderful, memorable time. Even though we've been back many, many times, that trip was one of the top 3. The other 2 were the first times my daughter and son went.