I know you want to visit Beihai Park.I went to Beihai Park with me family happily.That day the weather was nice so we had a good time.In the park ,we flied a kite,went cycling,went boating in the beautiful lake.My sister is good at swimming so she adviesd us to swiming in the lake.At the same time ,you should take care yourself and don't in dangerous.You should keep clean in the park as well as don't throw away soft drink bottles.I hope you will have a good time.