What should I wear?
Literally wear anything you want. Or nothing at all. Just remember that no matter how wild you get, someone -- or more likely hundreds of someones -- will make your clothing choices seem tame. Given that, the one thing we definitely suggest is sunscreen. Oh, and glitter. Lots and lots of glitter.
Where are the best places to watch the Parade?
The sort answer is: wherever you can. The glib answer is: one of maybe a dozen corner units at the Fountain Court apartments in Belltown, or from a west facing condo on one of the lower floors at the Escala building closer to Downtown. Both of those options have balconies with unobstructed views of the parade route… and are also almost impossible to hook up, so you better come up with something else.
One option: Buy a ticket for one of the three grandstands set up along the route. Another good choice is to stake out a spot at one of the parade's three beer gardens -- it'll be crowded and uncomfortable, but hey so will the rest of the parade, and this way you'll have beer there.
For people with disabilities, there will be accessible seating areas at Westlake Park, near the 4th & Bell stage, and at the "L" corner at Denny Way.