Mark
I visited Tenerife in 2005. Lovely spot for a 5 hour flight from Leeds. The volcano and the micro-climates are fascinating (as they are on the big island of Hawaii). The Tourist/ex-pat enclaves are to be avoided.
I played golf once, in the south and it was OK - nothing memorable. I saw Abama (the Euro Tour was playing there that day) and the 9th and 10th would make a great black run if snow ever fell. The cart path down the 9th has switchbacks.
Make sure you hire a car for a day or two and drive around the island, and into the hills/volcano area. And order some of the small potatoes with salt.
Of course, for a 20 hour flight, you could return down-under for summer.....
James B