I've been meaning to learn the piano too. Think I will get a keyboard in the new year.
I have a keyboard, also bought on a whim when I signed up for piano lessons, but since it was group lessons it was too slow paced for me so I ditched the lessons, along with the fee I paid for them, and it has sat there collecting dust since.
Same as all my whim hobbies.
I still want to learn though. I've always wanted to learn.
So far all I know for sure is how to play the eastenders music.