There are some very (in)credible organizations that allow 
individuals the chance to make a meaningful difference during 
their next vacation.  You not only get to travel to a new and 
exciting destination, but you will have increased chances to 
meet and interact with local people, participate in local 
activities, observe wildlife, and further an important cause.  
Volunteer vacations can be quite inexpensive (or not), take 
place in virtually every nation, and focus on a wide range of 
activities, for example, saving sea turtles, working on an 
archaeological dig, building a new school for local children, 
etc.  Most likely you can find a volunteer vacation that appeals
to you.