Between the red mountains
Top photo shows Agounni, one of several villages that lie up the river from Argana centre. There are about 4 clusters of villages right here, and some locals I talked to told me that there was a number of houses built for foreigners who loved coming down here for their holidays.
The second photo is from the prettiest part of Argana, right before you come to the bridge on the fourth photo.
You can see that there are quite some forces active in the river of Argana: the bridge is only just about passable.
The last photo is from the actual gorge. It is not so impressive by itself, but the richness of the river, and the surrounding landscape make it worth the visit. As this photo might indicate, it is not all that easy to capture the gorge.
Hotels and alternatives
Nothing, but camping should be safe. You could do this almost anywhere.
Restaurants and alternatives
Nothing. There is not even a café in Argana, which is most surprising considering that this is almost a small town.
Nothing. You will have to do this in Agadir, 90 km south or Chichaoua 100 km north.
You will have to take a bus which passes Argana on the main road, and then walk the rest (approximately 4 km). Getting back on the bus should be possible, but they are often full. Your own transportation is therefore a tremendous time-saver.