Their menu is very complete and you'll notice some hard-to-find asian specialties (like natto)
If you are a real sushi fan, you may want to sit at the attractive sushi bar on your left as you enter, where you can watch three or four expert chefs create and garnish plates. The sushi is incredibly fresh and melt-in-your mouth, and the size of the fish portion you get on each piece is larger than usual. The last time I went I heard a regular telling his guest that he thought this was the freshest fish in Boston.
You will receive both the regular menu (which lists the usual categories such as appetizers, noodle dishes, and sushi/sashimi dinners) and a sushi a la carte menu which allows you to order specific kinds of sushi. The lunch specials (on the last page) and dinner entrees (throughout the full menu) come with miso soup and salad.
The sushi (raw fish with rice and a dab of wasabi, Japanese horseradish) and sashimi (raw fish by itself) dinners are lots of fun and offer many choices depending on how adventurous want to be. One comes with half a cooked lobster, others are made up entirely of maki rolls (rice and different ingredients rolled in nori, a sheet of seaweed.) There is also a sushi and sashimi sampler for two people which comes out in a lovely boat, garnished with "clouds" of daikon radish strings.
Ginzu also has a sake bar, where you can try different kinds of sake by the carafe or glass. Sake is Japanese rice wine, cold or hot in very small glasses. You might want to order the "sake sampler," where you get 4 sakes in a black lacquered holder for $15.
The waitresses in kimonos who offer you a hot towel when you enter, the blonde wood and Asian fabrics, and the professional sushi bar make the ambiance very authentic. I have been for lunch and for a weeknight dinner, and there was no problem with the wait, but I hear you may have to cool your heels for a bit if you go at a busy time. The wait is certainly worth it.