If the younger family members are getting fidgety, make a trip to Seattle Childrens Museum. With plenty of interactive exhibits and displays, this place makes learning fun.
You'll have no end of sightseeing choices in Downtown Seattle. Seattle Children's Museum is an ideal place to begin here, but there are numerous other worthwhile sights to enjoy. Space Needle, Pike Place Market, and University of Washington are close to the interactive exhibit for kids and will fill in your day nicely.