Based on the level of respect or formality, you can say "I like windsurfing" in Korean in 3 ways:

• Informal: na-neun windeu seoping-eul joahae (나는 윈드 써핑을 좋아해)
• Formal: na-neun windeu seoping-eul joahaeyo (나는 윈드 써핑을 좋아해요)
• Very formal: jeo-neun windeu seoping-eul joahamnida (저는 윈드 써핑을 좋아합니다)