In Seattle --
The Westin is a nice hotel as is the Grand Hyatt. There is also Hotel Sorrento. I haven't stayed there but they are highly rated and supposed to be haunted. Once watched Ellie Kemper on Ellen tell her ghostly experience there. They also have afternoon tea.
--There is a restaurant called the pink door that is very popular, it's temp closed now but it'll reopen in April.
--The Georgian is this really beautiful restaurant/hotel...reservations can be hard to get so you'd want to book early. They have afternoon tea here too.
--I don't know if this is your cup of tea but Teatro Zinzanni is a fun experience, it's dinner theatre. I wouldn't say the food is great but the show is.
--5th Avenue Theatre is not talked about much but I love their productions, they have a new show every month.
Casual dining --
Raincity burger in seattle is great.
Our Food trucks are pretty awesome too, El Camion is amazing, serves real gorditas, not the taco bell kind.
In the Seattle Center there is food not served anywhere else. I really like this place called premier meat pies (traditional english pies). There is also the confection something...they make amazing little cheesecakes.
If you like Indian food the only really good place is in Snoqualmie called "Aahar"....There is one other one called Cedars that people seem to love.
There is a bar called the Unicorn bar in Capitol Hill. They have the most ridiculous desserts like deep fried snickers and fried peanut butter cookie dough. It's a real experience. Some people have had a bad time as it can get really crowded and sticky but if you go on a weekday, it's better but possibly boring...
Purple cafe is really good. If anyone is a vegan there is a place called Plum. It is amazing. They have something called Mac and Yease, which is vegan mac and cheese. My steak loving brother went crazy for it.
Hope this helps
