In her spare time, Her Royal Highness Princess Maha Chakri Sirindhorn enjoys various leisure activities. One of her favourite pastimes is reading which includes her interests in going shopping for books and collecting books in her personal libraries. Her love of reading leads to her talent in writing articles, poetry, short stories and travel books. Proceeds from her written accounts of her oversea travels are the main source of income of the Princess Maha Chakri Sirindhorn Foundation which was set up in 1979 to support needy students in schools, vocational colleges and universities.

Her Royal Highness Princess Maha Chakri Sirindhorn enjoys playing Thai classical instruments and practising Thai classical dancing. She sometimes paints. She is also keen on sports : jogging, swimming, biking and trekking, which give her an opportunity to learn about plants, trees and geographical features of the areas.

In addition to her knowledge of Pali, Sanskrit and Cambodian, Her Royal Highness is communicative in both English and French and has been learning Chinese, German and Latin.