I hope that weather forecast holds true. That would be fantastic weather!
As for my favorite memories, I guess most of the best ones were from our first trip with kids, when DD was 7 and DS was 4. Just seeing them experiencing Disney for the first time was pricesless. DS being afraid of most everything that first day and then gradually coming around. Both kids getting autographs and so excited to see the characters. DH losing DD in MK.

That wouldn't qualify as a best memory

but it is definitely something we will never forget. (happy ending-we found her with a CM

) Just all those special memories of your children going to Disney for the first time.
Our second trip was when DD was 16 and DS was 13. It was fun being there during Mardi Gras and wearing our beads and not sweating buckets like we do in the summer. First time at AK and going to Universal and IOA.
Last trip was in 2006. DD had just graduated college and DS had graduated from high school. We surprised them (ahead of time) with the trip at a restaurant. It was a celebration of their hard work so that was special. First time we flew to Disney (I hate to fly but it beats 11 hours driving).
DDP for the first time-loved that! DH getting kind of sick on RNRRC-first day, first ride of the trip. We had to sit down for 30 minutes until he felt better. Again, not a best memory, but one we still laugh about today.
I'm sure there are more, but this is what comes to me now.