We booked to travel with Visitanddo.com . First the plus points. The booking process was simple, the confirmation and instructions regarding pick up were good and having someone else organise transport and all the logistics is helpful. The Caminito del Rey walk is interesting, in places spectacular and is a good day out. It's not a challenging walk, either in terms of distance, ascent and descent. The guide we had went at a steady pace with plenty of stops, so that even the slowest walker could keep up.
The negatives. On leaving Malaga, the guide told us we'd have to detour to a village called Ardales, close to the walk. The reason seemed bizarre, something to do with getting our ticket and the absence of toilets on the walk itself. We were dropped off and pointed in the direction of the main town square where there were a few bars open and some people bought coffees. To be honest, it sounded like a money making racket. We then all loaded onto the coach again and set off. On arrival at the walk, we queued for our entry slot, put on our hard hats at set off. Miraculously, there were toilets at the entrance (so we didn't need to use those in Ardales after all). I looked at my watch at this point, 3 hours had passed since we were picked up! The gentle paced walk through the gorge takes perhaps 2 hours, after which we waited around at the exit for 20 -30 minutes and then a short walk back to the coach for the trip back to Malaga.
In total about a 7 hour time frame, with a 2 hour hike. It is spectacular in places, but there was a lot of hanging around and that trip to Ardales should be dropped, as the excuse was unbelievable. Was is worth about €50 per person? Difficult to answer. I think a family of 4 might be far better off organising a taxi there and back and buying the entry ticket on the website.