Hi Kelly,
I visited Majorca (Santa Ponsa-2005) once and did a few dives in it (not alot-but just enough to get a flavour..I was not a camera person then tho', so the only images I have are in my head!!)
I really enjoyed the dives I did do ....and I dived with these guys. ....www.divingzoea.com
I also dived the marine park called Cabrera- it was fabulous! Lovely Mediteranean sea-scapes, caves, visibility, life etc etc.
http://divingzoea.com/marine-reserves-majorca-cabrera.php
I would say Majorca has alot to offer as a dive destination- actually, any of the Baleriac islands are lovely for diving IMHO.
Hope this helps, and have a great trip!
Damo