As the CBJN reporter for the Seattle area, I would also recommend that you purchase a copy before your visit. I don't report on every casino every month, but few casinos go more than two months without an update.
A representative game in the area would be 6D or 8D, H17, double after split allowed. About half the casinos offer late surrender. Average pen is 4.5/6.0 or 6.8/8.0, but varies a lot from one casino to the next or even from one dealer/shift to the next. CBJN will give you a general idea of what each store will offer, but as with any other area, your mileage may vary.
There are also 2D games at some casinos, but with only a couple notable exceptions, the pen is terrible and the game is pretty much unplayable.
At most casinos, Pai Gow Poker is the most popular game, and Spanish 21 is a close second. Blackjack is not as popular (or as profitable for the casino). As a result, many casinos have only one or two BJ games, and they are not guaranteed to be open during your visit.
Most of the casinos are non-tribal "mini-casinos", and they generally have a better game to compete with their larger tribal counterparts. Here are some of the limitations and competitive disadvantages the mini-casinos face:
1) Game offerings: Mini-casinos may only offer card games. Tribal casinos can have video slot machines, craps, roulette, and other non-card games.
2) Smoking: The state has a smoking ban at any public location, including casinos. Tribal casinos are not subject to this ban.
3) Betting limits: Tribal casinos can have a $500 max bet; Mini-casinos can have a $200 max bet.
4) Number of tables: Mini-casinos are limited to 15 tables; I'm not aware of a limit for tribal casinos - the largest have nearly 100 table games.