One of the great things about Aruba is the almost always consistently good weather. In all our trips there, I would say there was part of an afternoon that was "ruined" by heavy rain. Usually there are the typical 5-10 minute tropical showers/rain and then the sun comes out, and the cooling breeze makes the heat comfortable. Because it's below the hurricane belt, rarely are major storms an issue, so while you read the occasional report of some rainy days, they are a relative rarity. The great weather is the trade-off for the foliage and lushness that you see in some of the other islands, since Aruba is a desert island.
Generally you can look forward to great weather, great food, friendly residents and an overall relaxing week.
Oh- and to answer the question above- the taxi rates are per cab, regardless of the number of people- and there are a lot of larger cabs for families too.
