I am signed up for another half-marathon (this one is actually 21.1km, not 23km) at the end of March at the Kaohsiung Medical University. It might be a little warmer, but starts a little earlier. I tried to map the course, but only got about 9km done before I couldn't follow the directions anymore. I am going to try to run the course I have mapped so far so I have some idea where it is going and what it is like. I think I should be able to run it in under 1:20.