Answer
Before choosing or arranging camping and overnight outdoor stays, work backwards from the experience you want and the problems you need to avoid. The useful comparison points are land permission, national-park rules, designated sites, weather, flooding, wildlife, fire restrictions, toilets, water, communications, transport and emergency access.
Do not assume an empty beach or forest area is available for camping. Use authorised sites and current local guidance, especially during heavy rain or high fire risk.
A dependable provider or organiser will answer plainly and will not hide an important limitation behind vague marketing language. If a safety, legal, medical or access question is involved, use a qualified source rather than an assumption.
Confirm the current terms directly, because Khao Lak services and activities can operate differently between high season, low season and periods of heavy weather.