While it IS cheesy - this was seriously fun! We went right at dusk so we could still see the view over the water, but the city was all lit up as well.
The scenery was amazing and it was kind of romantic and quiet and just us. Literally, because on a Wednesday night we were the only two people there! Which meant we got to go around a few extra times. :)
I probably wouldn't call this a "must do" in Seattle - but if you're looking for a fun date night we thought it was a blast! And we're really glad we went. We'll rate it: