Guitar, piano, piano accordian is fun with all the buttons arranged in the circle of 5ths, organ (as in Church), violin.
I even tried the clarinet, but have not quite mastered the change in registers (squeaking) - my dog at the time used to run off in fear!
I have a cello I want to teach myself too.
Yes I have a 'regular music room' packed to the rafters with instrument stands, music stands and the instruments themselves!!
I wish I could play really good rhythm (drums/bongos etc) - bought some bongos but really enjoy listening to a good operator.