Tipping at all-inclusive resort in Maldives

Please help me avoid some awkwardness. We have a family vacation (wo kids under 6) coming up at an all-inclusive resort in the Maldives. What is the tipping culture there? Is it expected (as in North America), and if so, what %? Or is it rather like Europe, where just rounding up a bit is noteworthy? I assume it's not offensive or otherwise undesirable, given their clientele.

And are dollars ok/preferred, or should we get sufficient Rufiyaa?

Thanks in advance.