Yes, not too impressed with the Alg.arve - too touristy, but then i guess i should of expected that.
Was not sure about going to Tarifa as the coast road from there up toward Malaga is horible but seeing as you recommend it i'll def go, and also pop in to Cadiz.
My top places in Portugal so far are:
Obidos (walk along castle walls)
the fort at Peniche was interesting, mainly the mu0seam which has top floor laid out as prison it used to be up until mid 70's.
Also i really liked the castle at Almoural (spelling), which is south of Tomar. The castle itself is a ruin on an island in a beautiful river, so you pay €1.50 for a short return boat trip - lovely when the sun is shinning.