Look in damp areas, such as dips in the ground, or in mulchy areas.When searching in area, find the lowest point and walk up the hill. It's more likely to find mushrooms in lower ground where water collects.
Mushroom hunting usually involves bending over most of the time, so it's not a great activity if you have issues with your back.
Kids can be a big help when looking for mushrooms because they are naturally closer to the ground. But be sure to discuss in advance that you want to keep the mushrooms intact. Otherwise, kids may have a tendency to stomp on the mushrooms or poke them with sticks.
Look at dead logs especially.