Speaking of crowds, there's a reason this unique park draws as many as 40,000 people for the Fourth: You feel like you're right beneath the fireworks. Plus there's live entertainment, street food vendors, traditional games like sack races and pie-eating contests, and most importantly, a beer garden. Best of all, Gas Works now has reserved seating if you want to shell out a few dollars ($40-$60), and an arrangement with Uber to drop-off/pick-up people in a dedicated zone of N. Northlake way, since no one in their right mind would consider driving themselves.
The patio at this divey and beloved Capitol Hill locals' bar is a garden oasis, with trees and greenery that typically creates a low-key experience that would almost make you forget you were in the city... save for the amazing view of the Space Needle and Lake Union, which is why on the Fourth it promises to be packed. But totally worth the hassle and free to the public.
From a boat
If you've got a boat, you've already got a great place to watch the fireworks. And if one of your friends has a boat you've got an even better place to do it… think about it: you get all the same benefits but you don't have to worry about cleaning up, or not hitting other boats in the dark. Or, you know, buying a boat. If neither of those things is an option there are several booze cruises, including waterways cruises, and Seattle Boat Parties. Unfortunately, Argosy is sold out.