Just returned from 2 weeks at the Tamarijn (first visit) and the mosquito repellant we brought from UK was useless. Bought OFF locally and faired much better. So a word of advice for travllers from UK, don't take Boots own brand repellant. It doesn't seem to work on Aruba but I'm sure it is very effective elsewhere (added the last bit for legal reasons)
Will do a trip report in the fullness of time but right now I need to catch up on some much needed sleep.