Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
The Ground.......... Sorry, I couldn't help myself.
Look at the fences and baseball back stops. check out anyplace that looks like it could have been a hiding spot away from the main playground or I what I call the bully zone. Along sidewalks as these may not have been there when the school was active. Definitely dig pull tab signals.
If there are no tell tale signs of the playground. Use a criss-cross pattern on the grounds until you start getting hits. The playground area will be the best hunting, where the vending machines were located will be another hot spot. Good luck.