The easiest way to see the sites around Bahir Dar is with a hired car and a boat on the lake. The most affordable way to do this is to join a group. Ask around your hotel and don't be afraid to approach strangers. They're likely doing the same thing. You can save lots of money, particularly if you're traveling alone. It's a great way to meet fellow travelers and swap stories (of which you'll have plenty if you're traveling in Ethiopia). Be open minded about where you go and you'll find a few travel companions.