There are multitudes of gap year programs - and they are not all equal in terms of experience. PLC suggests these tips when looking for a gap year experience:
You are not a tourist - if the program includes surface level visits to tourist heavy places, orphanages, refuges, etc. then you will not be getting the immersive global experience that best helps you grow as a person.
This is not spring break - if the program is all about fun, excursions, outings that cost extra, etc. you are not going to experience the depth of culture that is necessary to build your global awareness and cultural sensitivity.
Get outside the classroom - if the program is focused on classroom instruction and learning, then it is more of a study abroad. While you might grow academically, you will not get the opportunity to get truly involved with the global community.
This isn't temporary - while your gap year will only last a year, make sure that your program lasts 2-3 months at the very minimum. Cultural immersion and awareness takes time and exposure. Make the committment with your time to build bonds with community members you encounter. True understanding of other people and other cultures takes a lot of time and a lot of patience - allow for both.
These program attributes all exist in Global Citizen Year. Take a look here!