From Honglang North Subway Station to Shenzhen Bay Park, you can take Metro Line 5 according to the following steps:

1. Start from Honglang North Subway Station and walk about 10 meter to Honglang North Station.

2. Take Metro Line 5 (Central Line) at Honglang North Station and arrive at Qianwan Station after 8 stops.

The fare of Metro Line 5 from Honglangbei to Qianwan Station is 7 yuan. After getting off at Qianwan Station, you can walk about 500 meters to Shenzhen Bay Park.

Generally speaking, from Honglang North Subway Station to Shenzhen Bay Park, you can take Metro Line 5 and get off at Qianwan Station, and then walk to Shenzhen Bay Park, which is considered to be a more convenient way to travel.