Let's see if i can answer some of your questions.
We didn't use the shuttle, we prefer to rent cars. We saw a few people waiting for the shuttle in the am. Last year(2000) the shuttle didn't run at night. It no longer goes to Sea World and I don't know about IOA. I would call the hotel directly-- particularly near your travel date as the shuttles can change.
There is a TINY game room with pinball type games. Just enough to entertain for a short while.
Both last year and this year they had eggs and bacon/sausage every day.
The outdoor hot tub could fit about 6 comfortably.
I don't remember seeing a grill this year, although they had one last year, again call the hotel. I think it was a gas grill.
You will not be sorry if you stay at the homewood. It is very clean.
Hope this helps
wife of BigDave