Krabi/Phukert by train + safety on board
You could take a train to Trang or Phattalung and bus the rest.
Both towns' busstations are a bit far away from the rws tho - but doable.
I never had safety concerns on board a sleeper train other than the normal disproportionate unsafe behaviour of Thais in general... But do keep an eye out for low life farang - they are the worst.
Of course, NEVER disclose your destination to anyone, except trainpersonel.
1 photos
Look away if this offends you...
...because it is just a holiday snap of the first of the 4 Islands cruise.
The Shrimp is in the foreground, taking every precaution to avoid getting dark skin. Suprised she didn't bring a blanket to hide under.