I am stuck on Coron island - my plan had been to make my way to Phnom Phen today to be able to get the bus from there to HCM, but the wind is too high and so no boats are leaving the island!
Good job I plan in leeway with my tickets and visas, otherwise I would lose a day or so in Vietnam - though having said that - 3 months is a long time so one or two days won't matter too much.
I do know though that I need to get off the island soon, it's a trapped market and everything is really expensive!