Can anyone recommend some low cost hobbies or extra curricular activities that would be appropriate for a teen who loves to be alone? I'm looking for something that does not require having people involved, I love puzzles, kayaking, and being outside.

Something constructive and rewarding .. Like crafting. That could involve anything from woodworking, to stain glass, to furniture building, to quilting, to beadwork, to painting, to .. Well You get the picture.

... Or how about .. If you dislike people, but like animals .. Why not volunteer at an animal shelter?

If you like being outdoors by yourself, you might enjoy hiking and filming the wildlife you encounter.

Photography. I have sone great picture from my lone hikes. Just be sure if you are hiking alone that you let somene know what trail you will be on and what time you should be back. I fell once and ended up in physicall therapy for 4 months. I was able to hike back out but my husband had no clue what trail I was on if I couldn't.