- Collecting (stamps, butterflies, coins)
- Writing (journals, poetry, letters)
- Photography
- Pets and training pets
- Playing a musical instrument
- Penpals
- Sports which do not require a team or partner, such as long distance running, swimming or rollerblading
- Decorating
- Listening to music
- Independent travel
- Reading
References:
http://www.teach-nology.com/tutorials/teaching/introverts/
