My wife grew up in Bangkok; we've been there 3 times, and hope to go again this Christmas. Her family house is right in downtown Bangkok, near the sky train. It's sort of a "pink-light" district there -- not quite red, but plenty of bars, women, and cheap "hotels". Interesting place to live.
Thailand lives and breathes tourism. Almost everybody you -have- to talk to will speak some English. Anybody you don't have to talk to carries a calculator with a big display to show you how much you owe.
If you aren't Thai, you will pay more. You are more than welcome to haggle (except maybe at McD's), but whatever you haggle them down to is still more than a Thai would pay.
It is honeymoon safe.
Go during the dry season - December through March, I think. We always go around Christmas.
Don't go in the jungle when it's wet. If you must, and they have "leech socks" for sale, BUY THEM! Nothing spoils a walk like turning around after 50 feet because leechs are crawling up your ankle.
I can't recommend exotic destinations, unfortunately -- we've stuck around Bangkok so far.