One of my favourite things to do on a rainy day is write. Writing is a great creative outlet. Poetry is one of my favourite forms of writing. Where I live it rains randomly quite frequently, so I do a lot of writing.
When the only real cost involved is internet, electricity and stationary, its a great activity to get involved in. Enduring years of compulsory writing through schooling, primary, high school, college, Tafe and University has created strong writing habits.
With a wealth of accessible information, and being an educational experience, reading and writing is a great use of time.