The sunrise was nice, it was actually the wait for the sunrise which was the good part, and the sigh of relief after a strenous trek of 2kms (3 hours of walking for me). Other than the sunrise which is the resulting goal, I do agree that another great view is the sky with the stars. I've never seen such bright stars in the night sky before. There is a plain up the crater which looks over Mt Rinjani at Lombok, Mt Agung and the lake of Batur below. It was beautiful there.