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Everyone has things that they enjoy doing in their spare time. Express interest in other people's hobbies by asking about how they got into it or how they got good at something. People enjoy talking about things that they're good at. You may even end up finding a new hobby for yourself! Be honest about what you're interested in. If you know that you absolutely hate dancing, don't lie about wanting to learn a new dance routine. Everyone appreciates listening to music and watching movies. Music is a great way to connect with people through shared tastes. Movies provide a great platform to talk about a lot of different topics. If both of you enjoyed the last Star Wars movie, ask if they'd like to see the next one with you! When people are talking about music that you've never heard before, ask them to show it to you. If you've never seen a movie that others seem to enjoy, bring up the idea of watching it together one night. If you enjoy playing cards, bring a deck along and break it out during lunch. If you love playing catch, take a football with you to camp and keep it under your arm. Other people that enjoy the same things you do will notice and ask to join you! Try to bring things that are easy to carry. If it won't fit in your pockets or backpack, it's probably too big to take with you.
Express interest in other people's hobbies when they bring them up. Talk about music and movies that you enjoy. Bring things you enjoy with you to camp to find people with similar interests.