There's a renowned traditional Austrian restaurant in the historic LC property in Salzburg.

There's also a very good restaurant (with a good wine list) in the Westin Verasa Napa.

Westin St Francis in SF has a good restaurant in its lobby, although it's always been closed when I've stayed there, so no personal experience.

W Minneapolis has a very good (and expensive) steak house (with a pretty good wine list). BANK in the downtown Westin is also good.

RC Hong Kong has good restaurants, Italian and Chinese.

One could have a lot of fun with Michelin quality restaurants in Starriotts, but make sure that the spend counts as some of these restaurants are probably just tenants that operate independently of the hotel and, at least under the legacy Starwood rules, wouldn't earn points. There are also a few jurisdictions where points cannot be earned on wine and other alcohol, so this might not count for the Ambassador spend requirement either.