Do I need to book all my stays?

Hello beautiful redditors

I’m travelling to Thailand on 14th will be returning back to India on 25th.

My question is do I need to show the immigrating officer a proof of stay for all these days? I’m landing in Bangkok and was thinking to book a stay for the first 3-4 days then decide depending on how I feel about the place either to extend my stay or to move on to either Phuket or Phi Phi.

Is this allowed?

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