How about Zhuhai around April 10? Can you go to sea?

It's still a little cold to swim in the sea, but it's ok to just play with water. You can fly directly to Zhuhai. There is a bus from Zhuhai Airport to downtown, with 25 people each. Get off at Gongbei Pass, which is the place to cross Macao. You can see the sea there, but the sea in the city is a little dirty. The best place to see the sea is the island. You can go to Xiangzhou Port by bus or taxi. 1 hour boat near here, more than 3 hours away. I recommend temple bay island, the Little Maldives in Zhuhai. It's not bad to watch the sunrise and sunset. Take bus No.99 in Gongbei and walk along Lovers Road for a while, all by the sea.