Holiday Idea?

[h90]

We sit in Bangkok, my better half is from NakhonSiThammarat, so she prefers holidays in the south.

Destination should be reachable by car from Bangkok.

Place should be very environment friendly.

It should be possible to SCUBA dive there.

It should not be expensive.

We were before:

Hua Hin...didn't like it at all.

Chumphon: we liked it very much, but been there 10 times it gets borring

Koh Lipe: we liked it but not reachable per car

I thought of going a bit south from Chumphon, maybe arround Surat or Khanom, or what about the Andaman site?

Anyone has a recommendation? Or bad experiences?

thanks