Weird things happening at my new house advice needed

I just moved into a rural community in Hawaii from a large city. We're renting a house from a family friend and there's been a few weird instances, the police here aren't very responsive and I'd like some advice on what to do. There's a car that keeps coming by and stopping in front of our house. The first time I assumed it was a neighbor and went outside to chat with them (happens a lot our community is pretty close) but as soon as I walked out of the door the person drove away.

Last night there was what sounded like a podcast playing while my family was sitting on the porch eating dinner. It was so clear I could understand the words, but the only house close enough to us is empty. Our neighbor (the close house) is currently in another state comes for extended time off and doesn't rent his place out short term. I haven't seen any activity there at all as my office window overlooks his property. I've ordered cameras but things take some time to get here, do you have any ideas of things I could do in the meantime to figure out what's happening?