Have you played Mandolin before? Man, I love the Mandolin, and after playing guitar for so many years I took to it like a fish to water. Been playing Mandolin for over 20 years now, and the funny thing is, I only know about 4 chords - G,C,D,A.
Most of the time I just play scales, which seem to be laid out very logically in my way of thinking, and it just sounds so nice to tinkle along on the Mando in the higher registers! The Mandolin and the Piano sound particularly good together.