to serif or not to serif, that is the question

we got just enough freezing rain to cancel school today, so i'm in my own class...typography!  using the text "typography workbook:  a real-world guide to using type in graphic design" by timothy samara, i am learning more in-depth ways to play with words.

i downloaded the free graphics program "inkscape" so i can start to give myself assignments. 

i'm fascinated by people's answer to this question, indulge me here, "so if you woke up and had an unexpected free day, what would you do with your 24 hours?"