We have been several times now and thoroughly enjoyed the experience- have taken friends with us too who also couldn't believe the size of those guns! The views are fantastic too.
Really taken with how all the buildings have been restored far nicer than the usual concrete bunker- almost Disneyesque.
Yes the drive is an experience but views down into the valley are amazing, we met with a herd of goats and a goatherd at one point.
We have stopped here and there on route beyond Puerto Mazarron, before getting to the ascent into the hills and there are nice stops along the promenades for a beer and to look out to sea. Several little beachy coves that might interest beach minded people looking to avoid crowds in the summer months.