Glad to hear you enjoy Pattaya. It is one of those strange place that you either like it or hate it. I think most people who don't like it, don't like it because of the generally poor visibility, in comparison to the rest of the Eastern seaboard and significantly worse than Koh Tao, not to mention the Andaman Sea. However, I find it quite fun to dive there once in awhile because of some of the macro stuff you can find there. I have never seen a slender Seamoth anywhere else in Thailand beside Koh Sak bay. Koh Larn Pier has quite a bit of flatworms and some nudibrach, rumor of saw blade shrimp but I can't find one yet. Koh Rin is probably my favourite with xenocrab, whipcoral gobies, variety of shrimps and critters there but it is a bit unnerving to dive there since the island is officially belonged to the Thai Navy and just because it is the best dive site in Pattaya, they decide to use it as their main battleship target practice site!