There's a lot of guys use cavehill, I am one of the many, it is very steep with very little flat ground for camping or shelter building, beware of overnighters unless you fancy a run in with the numerous local chavs who use it as a drinking den and gathering point for other antisocial behaviour, I have come too close too many times to being in a very dangerous predicament with intoxicated teenagers in large groups..for daily walks it's great but you will compete with ramblers ,mountain bikers and the like, and remember you're on the edge of north Belfast, so don't expect an easy time of it if you want to go ahead, good luck and if you ever decide to go up the hill I'll be glad to accompany you.