You can stay out in lake wa and still have a pretty good veiw of seattles fireworks and go over and watch bellevue and kirkland. We did it last year in a buddy's 30' ciera, Although he is moored in kenmore AND scared for life from doing Lake union and the cut the year before(his first year witha boat).
You could also do a fireworks cruise. Argosy puts all their boats on 'em that night.

We are thinking about elliot bay and anchoring in blakely harbor to sleep... No ramps, short run from downtown, should be really quiet...