Depends on how flexible you are there's a story on this topic here: Do I need reservations for my holiday?
#2 somtam2000 has been a member since 21/1/2004. Location: Indonesia. Posts: 7,800
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If your plans are set for which beach you're going to when, you might as well do it sooner rather than later -- especially if there's a place you definitely want to stay at. Things will only get more expensive as the holiday season approaches.