In reply to orangelizard:
Hopefully not going off topic, and not knowing the place as well as others, I just wanted to emphasise that practicing anchor building outside is I believe all about the placements. This is the bit that matters.
How you connect the bits, with rope, or cord, or sling, is secondary. And this element is just as easy to practice at home with the legs of a table, or a tree in the garden. Yes, someways might be better or faster, but as long as you are sensible, almost all are good enough. I'd say it might be better to practice this element at home, because then the book or kindle the information is coming from will not blow away into the sea. It also means you can practice in the rain or at night and not eat into climbing time.
Using bolted anchors might not be much use, as this is no different to table legs.
A cliff that relies on stakes but has fragmented blocks you might be able to use as well but still need to incorporate the stake to be safe sounds less than ideal (again I'm not a local, but I looked at the images in the guide book).
T'other day I went out with a climber with 10 years plus of experience. I asked him to put a bunch of cams into the base of a cliff (limestone). I put a sling on each and pulled or jumped up and down on it. Half the cams pulled. This I believe is the key to teaching anchor building outside: the examination and testing of placements like those you might actually use. The rest can be done at the climbing wall far better.
Sorry for the rant.