"The scariest thing about caching by yourself is not the wildlife but other people. I got within about 230 feet and I heard other people talking. I stopped and listened for a minute and then I noticed 2 guys with machetes and a metal detector about 50 feet from me. Luckily they were in the brush and did not see me. I do not know what they were doing but I decided not to go after this cache today."
It's all in where you go. I try not to overinflate mine. Rate what you're comfortable with during average conditions. Higher D really doesn't mean it's more difficult to find. Muggles are just a factor in your ability to search stealthily. And in many cases, it's the cacher's comfort level more than the muggle factor. Unless it's in plain view of the business, etc. But off to the corner by an air station... usually comfort, less muggles being a true factor.
I did the same thing to get a D5 rated souvenir and muggles weren''t even an issue- not near as bad as some of mine. Which is why I asked the question. A couple of them are at air/water stations at gas stations. After a cacher posted in her log that she had to wait on someone using the hoses, I thought a note should be written in the description. Personally, we use our compressor at home if a tire looks low. Maybe I should relocate them? Or up the difficulty from a 1.5?
Recently did one (it was just recently archived) that was a 5* difficulty for that reason. Hey - got a souvenir for it, too!
I wouldn't have rated it more than a 2. Maybe a 2.5 if I was feeling extremely generous that day.