When my hair starts to grow back, I can only wish that it comes back blonde with perfect natural waves, a la Kate Hudson. Wishful thinking since I have the dark, straight, hair gene. I love a good natural wave but like most everyone's hair, it takes work. If you are lucky enough to have this type of hair but straighten it because "I don't have good curls" here are some things to try so you can have good hair.
Use a diffuser along with a curl creme (something for frizz). Then have a curling iron handy for unruly or straighter pieces. It is a myth that curly headed girls just wake up with perfect locks. When you are all dry, use a serum to control frizz and then hairspray.