Bring them.

Used to holidaying in Egypt where there's a reef just off the beech teeming with life... Anything like that here of just the odd bit of interesting life?

Tenerife has a lot of to see under the water; in the harbour bay at Las Galletas there is a small outcrop of rocks that always has a lot of fish which can be seen by snorkellers. Even off the beaches you can see lots of life. If you are interested in snorking how about going for a try dive so you can see even more; have a look at this site to wet your appetite: http://www.atlantic-divers.com.

Being asthmatic means there are problems for me and scuba... Need to see my Dr first...