First of all a big thanks to Mark for all the help you're providing from the biggest of our host cities.If you are referring to the Space Needle, if we have 15, we can get the group rate which is $15.00 instead of the usual $17.00. A "benefit" for me is we can (actually need to) reserve a group rate ahead of time. And hopefully not need to wait on long lines but rather be quickly whisked up the elevator. Otherwise, it might not be possible to do, given time contraints. The view from up top will be well worth the cost. I'll check on the particulars.
Time constraints are an issue on that Wednesday, only because we have to catch the first Sounder of the afternoon towards Tacoma in order to come back on the second and last return trip. If it won't work out, or we won't have a decent amount of time, there's always Saturday (which is totally open from the time folks arise after the late night arrival from Vancouver until those going on the eastbound Empire Builder need to be at King Street Station). That is, if we're not doing one of the many other activities you listed for us above!