seattle attractions?

my MiL is going to be in town at the end of the month for a couple of weeks. since we're still new to seattle, i'm looking for ideas as to what there is to do around these parts. so if any of you locals (or folks who've been here) have any suggestions, i'd love to hear them.

i'm overloaded with school stuff these days and haven't had the time to figure out what we can do while she's here.

Jak's brother's going to be here as well for a few days, but i think we know enough stuff to fill in that time, it's the longer visit i don't know how to cover.