I've teaching myself to play piano (well, keyboard) on the side for a few months without a teacher. I've had prior musical experience before so it wasn't too difficult. I'm at the point where I can string chords with melodies by ear fairly easily (although I'm only proficient in C and D major). I can play stuff like Lord of the Rings, Christmas songs, movie scores, etc.
I'm not really sure what I should be practicing though, since I don't have a teacher to guide me. I don't really use sheet music unless it has chords notated on it since I'm horrible at sight reading bass clef (esp. at the same time as treble), and I can't really play eighth notes on left hand yet.
Any suggestions on how to practice and develop my ability? I mainly play just for relaxation/enjoyment.