Wat Chaimongkron is on South Pattaya road opposite the market and about 400 meters from the entrance of Walking Street, as you can guess this place is quite popular with Thai sinners to make merit.
It also used to be quite infamous, well disliked anyway by the residents who live at Centre Condo which overlooks the Temple grounds, they would get up in the morning and open their balconeys to view the pattaya sea and let the cooling fresh breezes from the sea blow into their rooms, then the Monks would fire up the incinerator and burn a body, the ashes gently lifting into the air and wafting into the condos, obviously this upset a lot of the farang residents, although you could say that they should have learnt a bit more about Thai culture before investing in a condo in Thailand, or perhaps even asked the sales agent what the big chiminey thing was for, this must have gone on for about 15 years but now I believe they don't incinerate the bodies there anymore.