Ranong is not so friendly .... used to be so nice, not anymore. You will need to show 20,000thb, onward ticket and proof of accommodation. This is for everyone. Anything missing and they will direct you to use one of the agents hanging around.
Andaman club har re opened for border bounces. It's a lot more expensive now than before COVID. I don't know exact cost but around 2400thb for round trip on speedboat.
You ARE going to need some kind of onward ticket and the 20k cash.