I've been diving for about 4 years...just did a couple in Jamaica last month.  They were my first tropical dives.  All my others were in the northeast Atlantic (off the coasts of Maine and NH).  Talk about a different environment!  That, and not having to wear a 7mm neoprene suit while diving definitely makes the tropics great dives.
I'd love to do some A/C wreck dives in the future...