今天是6月14日，星期日。安迪打算和家人去海南岛旅游，可是他父母只允许他在温度高于30℃的时候才能游泳。请根据下面的天气预报完成给他的建议。

6/15	6/16	6/17	6/18	6/19	6/20	6/21
Partly cloudy	Rainy	Cloudy	Partly cloudy	Sunny	Sunny	Rainy
16℃～20℃	14℃～18℃	15℃～19℃	18℃～25℃	23℃～32℃	22℃～31℃	20℃～29℃

    Hainan Island is a good place for you to visit in this season. But it will be on June the 16th and June the 21st. It will be partly cloudy on June the 15th and June And it will be on the 17th of June. These days are not suitable for swimming, because the temperature will be below 30℃. You know your parents don't allow you to swim in such cool days. Luckily, it will be on June the 19th and the 20th, and the temperature will be above 30℃. So you can on the two days, but remember that safety is first. Wish you a happy holiday！