Hi Jennifer,
You and your family will really enjoy staying at Bay Lake Tower.
There is plenty to do at your resort!
Your little one will likely love being in the pool!
There are a number of recreation type activities that your husband can do with your son.
HERE is the link that lists what is available.
If you are looking for a children's activity centre, you can reserve a spot for him at the Mouseketeer Club which is located at the Grand Floridian resort, a quick monorail ride will take you over. It opens at 430pm to midnight and it is a fun filled night for the kids.
HERE is the link with more information.
Enjoy your conference and have a wonderful vacation with your family,
Carrie