We've been on a few holidays now with our DDs (now aged 3.5 and 4.5) and the best advice I can give is that if it is a holiday aimed at adult stuff, ie lots of sight seeing, temples, museums etc then your DD will probably not have that much fun. And if she's not having fun, you're not having fun! Our last two holidays have been planned first and foremost on what the girls will enjoy doing and as a result, we've all enjoyed them. Some of our holidays have been with nappied children and while its a bit of a pain carting them around, that wouldn't stop me taking them.

Also, what is the medical care like in Sri Lanka? Can you drink the tap water? Always a concern trying to convince a little one not to drink the bath water, swallow water when brushing teeth etc.