Thanks for your help.
I'm asking this because we did this last December and stayed offsite in a condo. I had to get up early and take him to the conference every morning, then drive back to get kids up and fed, then off to the parks. I felt that if we stayed onsite, it would be easier for him to catch the bus to DTD and then just walk over to the Grosvenor. It looks like that's not going to work though.
I'll look into Priceline for a room there. We stayed 2 nights at the Wyndham last year via Priceline, and for the room we received, it was barely worth what we paid. I'll research bidding for that area again. I really wouldn't mind staying somewhere in DTD that's nice, but my GS loves the bedtime stories that play on the resort TV system at night.