Playgrounds during COVID

Ma

We’re a very COVID conscious family. We have a 4 yo, 2 yo, and a 7 month old. My older two are AVID thumb suckers. My oldest can restrain herself if needed, but my 2 yo is non-stop. We really haven’t been anywhere since COVID because I’m so worried about them putting their fingers in their mouths. My oldest will wear a mask, my 2 yo will for a bit. But I’m getting so depressed about not taking them to playgrounds. I really want to go to one I’m just nervous about the germs. We would only go to ones that are empty (our county has so many and they’re amazing). Just looking for some reassurance or experience- like if your children have similar habits and if everything has been okay. Thanks for your help!