I think this is great! But I'd look for a way to make your column particularly interesting . . . See if you can go and DIVE the sites you are writing about. Then you can put up the factual information (directions, parking, depths, favorable conditions, etc.) and finish the column with "My dive there". That makes the column particularly relevant to the newer diver. And, if you solicit local divers to help you with your dive there, it will also make you a bunch of diving friends.