1.Will you come back to SanYa?（你将来会回三亚吗）
or
Are you coming back to SanYa?(你近期会回三亚吗?)
2.Do you have any plan coming back to SanYa?（你有回三亚的打算吗?）
or
Do you think you'll come back to SanYa?(你想你还会回三亚吗?)