As a travel agent who specializes in the group travel market I have to stay on top of the ever changing travel trends in this niche. Being a group travel specialist it is important to focus on each group individually to design and customized an itinerary to fit their needs and interests. You may have two groups going to the same place for completely different reasons and expectations. Customizing is the key for a group travel niche.
There is no end to the types of groups you can rally up. There are theme groups, adventure/adrenaline junkies, history seekers, hobby enthusiasts, foodies, work groups, reunions, just let your imagination flow! I love the group travel niche because its challenging and you get to form relationships with your groups.