My hair is naturally curly.  Curlier on some days, wavier on others.  You will rarely see me sporting my curls.  I just feel undone unless my hair is blown out.  In the summer, however, it gets harder and harder to fight the frizz, so there are days when I will embrace my curls and waves and just go with it.
Summer is also a great time to try out fun new hairstyles.  As my fashion tastes lean more toward the boho vibe in the summer, I am also drawn to pretty braided looks and messy updos.
Here are a few looks that just say summer to me:

(click on each photo for a tutorial)