Drop down to 20psi for sand, and if you encounter really deep horrible sand that you're struggling to ride through, go down as far as 10psi but be sure to up the pressure as soon as you're able. Better if you've got rimlocks for that though, at least on the back wheel.
I'll be following your trip on facebook, looks like you've got a really good little group there! That's the toughest part of travelling, finding the right people to do it with who share the same sense of humour. With some good mates with you (ready to take the piss!), all problems are easily dealt with.
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