There are TWO 21 Choices here!
If you don't know this about me already, I have always loved frozen yogurt and the comeback it's making the past few years has made me really happy. I have such fond Penguins memories of my childhood and then for years it was tough to find good frozen yogurt. My current leanings are towards tart flavors. If you don't already share my love of 21 Choices, give it a try (there's one in Old Town Pasadena too).
Here are a few "insider" tips:
You can check out that day's yogurt choices on their website. For instance, you can see if your fav (mine is snickerdoodle cookie) is available that day.
You can skip to the front of the line (particularly useful in Old Town) if you just want one of those daily choices and no mix-ins. They also have a nice little size if you want to indulge just a little bit.