This may be an unpopular opinion, but I've always felt it selfish when people of means partake in 'aid trips' over sending money to an appropriate organization. If you care to help, leverage your abilities efficiently; make the money doing what you're best at, and let others administer the aid.
"Voluntourism is ultimately about the fulfillment of the volunteers themselves, not necessarily what they bring to the communities they visit." [1]
“Basically, we failed at the sole purpose of our being there. It would have been more cost effective, stimulative of the local economy, and efficient for the orphanage to take our money and hire locals to do the work, but there we were trying to build straight walls without a level.” [2]
[1] http://www.psmag.com/business-economics/instagrammingafrica-...
[2] http://www.independent.co.uk/travel/news-and-advice/voluntou...