I was teaching a similar course 2 years ago and also had a problem to find right book.
The course I had to teach had to cover axiomatic approach and give some feeling of Lobachevsky geometry.
There are many books for school students, they are not exactly suitable for undergraduates. I ended up at writing my lecture notes. It is based on Birkhoff's axioms (=minimalism with no cheating). (This year I will teach it again, maybe after that the lecture notes become better.)
