Thanks, great feedback! I will definitely change the font and play around with the routes to try to get a smoother look. It's a good idea to color them according to difficulty.

I did the text in Inkscape and imported it into GIMP but maybe it makes more sense to do it the other way around, i.e., import the background into Inkscape. Either that or just increase the resolution of the imported text so it doesn't end up looking pixelated.

Regarding legal issues, I somehow don't even want to go there. If I distribute this map it will be to people who are old enough to accept responsibility for their own actions. Writing "Climbing is dangerous" on the map seems superfluous at best. Admittedly I don't have much experience in this area but there has to be limits.