This was my second half marathon and it taught me a lot of things which you can find here in details:
https://multiemotions.wordpress.com/2017/02/27/lessons-i-learnt-from-my-second-half-marathon/

I had not much experience of running up and down the mountains (because I live in plains) and that was the most struggling factor for me throughout the race. HOWEVER, the scenery along the route is so beautiful and so serene that it could pull you through the entire course. In my case, it let me walked :D