Yup - look around your town for the tallest and usually oldest trees and get permission to detect in that area, IF you dig holes do it clean and neat so they can not be seen when you are done.
Find a way to be notified about sidewalk tear ups in the older parts of town, check to make sure the tear up crew boss is ok with you detecting and have at it. Remember to say thank you and mean it while you are shaking his/her hand.
Locate places where people tend to congregate, ask the older folk about this. Get permission, etc.
Stuff can be found where ever people go on a regular and even infrequent basis. As humans we just loose stuff and of course some people just felt the need to hide stuff (1920's depression times, WWI, WWII, eccentric types - all sorts of reasons to be able to have things in the ground)
Look for old home sites where the home isn't even there anymore and look for the fence line somewhere close to the house to detect along it or the clothesline (people used to hang their wash outside for it to dry and I would guess some guys hung their dirty clothes outside to get it washed and dried [just a thought]).
Best of success, 63bkpkr