I'm staying up in Minnesota for the summer, came out to the hotel parking lot and someone was out looking at the Mustang and taking pics of it, while I'm flattered about that, I'm also a little concerned? What say you?
As long as they weren't looking inside and trying the door handle I'd take it as a compliment. I've walked out to people posing by my car and taking pics. One of the last ones said I inspired him to get his Bullitt out of the garage and get it driveable again.
Start talking to them; if they run off, I'd really be concerned. If they stay and talk about yours and their cars, you're probably ok. You might mention it to the place you're staying, inquiring about security and expressing your concerns.
WAAAAY back in 1985 I had a 1983 Hurst Olds 15th Anniversary car (black over silver). This is obviously before the internet and I had an unlisted phone.
One day my phone rings and some guy I never met says he heard I had a Hurst Olds and wants to know if it's for sale and he would like to see the car and take pictures of it. It hits me more than a bit odd, but I agree to meet at a public place. He looks at the car and offers me $500 more than I paid for it new including taxes (it was my DD and I had over 20k miles on it). He showed up at the DMV and had the money and became the new owner. I just left shaking my head.