Thanks Heidi! Let me know if you have any questions.
Hi WilliamsMom. I'd hold off on the MK until Tuesday, 2/17. Monday is likely to be busier than Tuesday because of the holiday.
I just got back from WDW with my 5.5-year old daughter. She went on Splash Mountain and Big Thunder Mountain several times. William shouldn't have trouble with those. Space Mountain's a toss-up. One idea would be to explain to him that it's an indoor rollercoaster that goes about as fast as Big Thunder, but in the dark. That'll put it into a perspective he may relate to easier.
The Tomorrowland Transity Authority is a slow-moving ride around the outskirts of Tomorrowland. It's very relaxing, which is why most people ride it. But it also goes through the inside of Space Mountain, and you can see some of the attraction from the TTA. You might want to take a quick spin on the TTA to see if William is interested in Space Mountain. I think those two things will probably help you to gauge his potential reaction.
As far as what to see first...I'd go with the two-day touring plan in the Unofficial Guide. It's comprehensive and should minimize your wait times. I like the half-day strategy. Perhaps stay 'till noon, grab something to eat, then head back to the hotel for a nap. (The nap's for you, not William.
.) You could return to the park in the late afternoon/early evening, or go somewhere else. How's that sound?
Sincerely,
Len