Over the years the travel industry has continued to become more diversified and specialized. The coming years will bring even more diversification and specialization to tourism. This will include more cross-over between different "market segments".
An example of this is the blending of adventure travel with volunteering (voluntourism). Here's a story recent published on the topic:
Why Blend Adventure Travel with Volunteering
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Here are a couple selections from the above article:
Get the best of both worlds
Undoubtedly one of the most attractive things about combining these two types of travel is that you get to have your cake and eat it too. Rather than restricting your experiences to one type, you really get the best of both worlds, embarking on incredible adventures such as jungle treks, and reaping the rewards of helping local communities.
In-depth cultural experiences
Another reason to combine volunteering and adventure travel is that it offers an unparalleled chance to get under the skin of your chosen destination. The adventure side of things allows you to explore lesser-known places and try your hand at a wide range of active pursuits, while volunteering means you can get to know locals and learn far more about their way of life than you could otherwise.