Tenerife was alot of fun! The tour we went on was excellent. I think it might have cost $50 (Tenerife is inexpensive compared to other European cities) for a four hour tour. All the Cava you could drink as well as beer and water and snacks was included (we also took a few for the road and no one minded). We saw lots of porpoises that came very close to the boat and also got the choice to swim AND visit an all nude beach. Of course, that part was optional...
Anyway, a great time was had by all.