Longmenwan west street. Ai Xin Agricultural Park in Xinhai New District is located in Xinhai New District, Weihai City, China. The address is the north side of Longmenwan Wetland Park in the northwest corner of the intersection of Mamaidao Road and Longmenwan West Street in Xinhai New District, Weihai City. Agricultural Park covers an area of more than 20,000 square meters, which is a comprehensive park integrating picking, leisure, fishing and catering.