<Other sites like the Similans (sometimes possible in the present greens eason) are truly world class.>

Think you mean green season? The Similians and the Surins are good but they are officially closed in July and August. You can't stay there but you might be able to get a dive trip if the weather's OK.

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“Not all those who wander are lost.” Tolkien.
Life is not measured by the number of breaths we take, but by the moments that take our breath away.