you may say, "I will go to Hainan for summer practice." or you may also say, " I will go to Hainan to practice for the summer"

I'm going to Hainan for a summer practical. I'm doing a summer practical in Hainan. **Revise how to express future actions.** I take it you will be practicing in the summer what you already learned previously.

If I understand your example correctly, you would say you were going to Hainan "for" summer practice.

Oh, it's hard for me to choose the best answer. Thank you Brad C, Eliot and Cristine for your help!