雅兴 is a polite, slightly literary expression — used to compliment someone's cultivated mood for refined activities (calligraphy, tea, poetry, garden visits). The pattern
有雅兴 (yǒu yǎxìng, 'be in a refined mood') and
雅兴大发 (yǎxìng dà fā, 'one's refined enthusiasm bursts forth') are fixed. Don't apply it to mundane interests.
