We started hunting tot lots for the first time in 2006. For the next three years, we had amazing gold recoveries. As we got better tot lot machines the gold slowly started to slow. Now it is strictly on fresh drop bases, but still worth it during the school season each week.
Best finds have been at the bottom of slides and around the sides, as well as swings. Necklaces, of course, have been best under chin-up bars and hanging toys. Even using your pinpointer around the bottom of polls can be fruitful.
Many miss the small pendants, earrings, and gold chains because they often sound like iron. If you're a sound-only hunter you'll miss them. I have found that bobby pins, paper clips, hair barrettes, tacs, etc. will read a VDI the same from all directions, whereas a gold chain, earring or pendant will read higher in one direction. For example, on my Deus junk iron will read a 04 from all directions. A piece of something else other than iron will read a 04 one direction and 06 from the other.