Mizuna is a gem, an impeccable yet comfortable little restaurant that joyfully presents its remarkable cooking skills without arrogance.
I've never had a dish disappoint. While lobster mac and cheese is now a rather dreadful standard these days, I believe it was introduced in Denver at Mizuna, and their take is sublime and wonderful. Another example is the foie gras, an ingredient too often brutalized by heavy handed chefs, is perfectly seared or roasted with clever accoutrements.
The fish is as good as you will find anywhere, and the meat side will always have something unique like ostrich.
If you are looking for a great place to dine with your SO with creative food and friendly yet professional service, Mizuna is the place to go.