funrecdivers post makes some sense however diving in murky water when your in the tropics does not sound to me personally like a fun day out when you can be diving in 25m Viz with stunning colors which is why most people come to Thailand, if you want to dive in murky water better stay home and dive there.
Sorry, but I'm having a bit of trouble understanding this 'viz thing' and how it becomes directly related to "fun diving".
When I was a beginning diver nearly 30 years ago in the Red Sea and the Arabian Sea, I spent time in ocean water that was high visibility with colors very bright. However, I don't think that this defines diving or "fun diving" for many of us today (after some experience), including yours truly funrecdiver.
For example, beginners enjoy flat, calm water when they are learning white water rafting or canoeing; but after a while, they are bored with calm water and prefer the challenge of the sport and increasing levels of difficulty. Pretty soon they are bored with only calm water and prefer raging river currents and passages. The same is true for just about all other sports and we could create an endless list where beginners prefer (and should train in) unchallenged conditions, but they gradually prefer a much greater mind and body challenge.
Yes, for novice divers and tourists who rarely dive, perhaps "clear waters and high visibility" defines a "fun dive", but I can assure you, it can absolutely be more fun to go down a murky decent line in 3 to 5 meters visibility with a bunch of divers to a shipwreck and explore it with flashlights than to see the wreck at the surface and without any visibility challenges! Fun!
The same is true for diving in ripping current and other low visibility conditions. It is thrilling to dive in conditions where you are literally flying underwater and you must work as a team to keep your buddies in sight because if you get more than a 3 to 5 meters apart, you can't see them.
These types of fun dives improve skills and creates a great sense of team spirit unparalleled by simply "walking in the park". So, I am a bit confused by all the dive center operators who seem to want to tell us that the only good diving (or "fun diving") is "walk in the park" diving.
In other words, just my fun diver opinion, if a diver believes that the only "fun diving" is crystal clear water and no current, then that is OK (for them of course); but like most other sports, many experienced practitioners tend to opt for more challenging conditions. I don't think that diving is an exception (at least it is not for me and most people I know who are divers in Pattaya). There is a lot more to diving than simply "sightseeing", at least for many divers (who dive regularly and enjoy improving diving skills and team building.)
In closing on this reminder in a (hopeful) harmonic reply to KohLantaDiving (and others who tend to berate diving in challenging ocean conditions) is that diving in challenging conditions can be much more fun that "a walk in the park" sightseeing in crystal clear waters (for many of us, not all of course).
And to my original point on DMT, there is more than one path to DMT. One path seems to be one where the DMT simply "logs fun dives" and another path is "improving skills in varied, challenging conditions". Personally, as a customer-diver, I prefer to dive with dive leaders who, at least, are comfortable diving in very challenging conditions and can organize an exciting drift dive in low viz or create a sense of adventure on a mysterious, murky wreck dive.
So, I am not sure how "fun diving" is somehow directly equated to "clear and easy diving".... it seems that this should be called "sightseeing diving" or "walk-in-the-park diving" or something a bit more descriptive of the activity than to discount all the great diving outside of "walk-in-the-park-clear-and-calm diving" as "not fun". Great viz is nice, but it certainly does not define the entire realm of "fun diving", for most people I know and dive with.
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