I am thinking of spending the day walking to Space needle area (don't think we'll go to top) visiting the Chihuly garden area(is it pretty outside there too?) possibly visiting the museum of POP that looks like fun, and walking to pikes place market (or taking monorail) just to wander around.... we are likely to be fairly lazy ..... The underground tour sounds intriguing, seems like a lot of tours available, is it really interesting is my big question.