One of the best things you can do for any animal is to learn what it IS, not what you want it to be, and treat it accordingly. For example, if you treat a cat like a dog, the cat is likely to avoid you, hiss at you, and scratch you. If you treat it like a cat, however, it will spend time in your lap, purr for you, and sleep with you.
Quail are small, prey animals, so you want to make things as non-threatening for them as they can. Provide them with safe spaces and let them come out only when they feel safe. They will often appear active in open areas because they are actively looking for places to hide.