The Dutch Royal House has, IMO, the best and most interesting information about the hobbies and interests of their members.
Here are some interesting ones (but not all!):
Queen Beatrix: sailing, sculpting, ballet, painting, and music
Prince Willem-Alexander: flying; sports of all kinds (he must be athletic), including tennis, rock climbing (very interesting), and skating. He even completed Elfstedentocht, the big skating marathon, which must have been quite a task. More info
here.
Princess Maxima: nature, the arts, music, dance, and watersports, skiing, and running.
Prince Constantijn: drawing, football, music, cooking, tennis, golf, and skiing.
Princess Laurentien: reading, working out, travelling, tennis, sailing, and photography.
Princess Margriet: reading, the theatre, walking, riding, and the "culture, flora and fauna of the Arctic."
Professor Pieter van Vollenhoven: music (he was part of a trio that gave concerts to aid the Victim Support Fund, which he chairs), golf, diving, and the culture, flora, and fauna of the Arctic.
Prince Maurits: music, cooking, sailing, skiing, and running. He ran the New York Marathon with Princess Marilene and friends.
Princess Marilène: tennis, skating, and running. See above.
Prince Bernhard: windsurfing, sailing, swimming, skiing, and music
Princess Annette: tennis, hockey (interesting), skiing, the internet, and reading.
