Should I take swimming lessons or singing lessons?

My mom wants me to take something during the summer...And if I don't choose my dad will force me to take piano lessons with a strict teacher and because I don't like playing those old classic songs. I would only learn if it was for a talent show with a song coming from this year -.- Also now my mom is asking if I should join karate.. with my brother. I think I would like karate cuz im with my brother. Can you help me decide? Swimming, singing, or karate?