Take a bus from Laixi to Laiyang bus station, get off at Huangyan intersection of Haiyang from Laiyang Central Station, and then wait for the bus from Haiyang to Sima Guanzhuang. This bus usually takes more than half an hour. If you are in a hurry, there are plenty of private taxis at the intersection over there. Generally, 15 yuan will be there.