Tenerife

I'm off to Tenerife on Friday, just wondering if any of you have been and if so what the oppertunities for fishing are like. I understand you can go big game fishing? How much is this likly to cost? Really I was thinking more of a bit of Gaurenteed action that trolling the deep sea for hour after hour. I was also thinking of possibly taking my little lure rod with me for in and around the shore/harbour.