I have been to Europe 5 times, 6 if you count going to Lithuania for a Yiddish class but saw very few museums or sites that I would have seen as a tourist. I have been to South-west Florida, the Los Angels, California area. I went to Washington DC, Ohio but I didn’t see it too comprehensively, and Chicago. My parents took me to New York City when I was 16 but I may not remember much. On the way to Lithuania, I gave myself barely enough time to see one art museum in Boston; I didn’t see Boston as well as if I had planned a trip there. When I was a kid my parents took me to Niagara Falls and Toronto Canada, twice, although I may not remember either place too well. Once as a adult I took a solo trip to Sleeping bear dunes national park in Michigan. I camped there for 2 nights. I had a tent and 8 top-layers but I didn’t bring a sleeping bag, it was approximately in the 40’s at night, and I had a lot of trouble falling sleeping.
I have thought of going to France, Germany, or Peru (or all 3 at different times). Alternatively I was thinking of going to Ottawa, Canada, or laying off leaving the country and traveling to Tennessee or a National Park like Yellowstone in Northwest Wyoming, or the Grand Canyon in Arizona.
(If any of this this matters: I am a single man, I would be traveling solo unless I signed up for a whole-trip group tour, which doesn’t sound appealing. In 40 years I will be 80; my great-grandfather with my same last name had a heart-attack and dropped dead just before he would have turned 50; my grandfather with my same last name lived to be 96-1/2).
I don’t care much about seeing wildlife. Unusual scenery – mountains, waterfalls, canyons, and so on, would be nice.
Would the national parks be too dangerous to travel-to solo? Which would have to be mostly camping because the hotels are too expensive; for example the cheapest hotel near Yellowstone is just under $113, probably not including some taxes and fees. Most hotels in the Yellowstone area are about $125 to $400 a night. And there would be a huge amount of driving involved but I would want to do at least a little bit of walking each day, if only to compensate for sitting in the car so much. I am vaguely aware that you are “not supposed to” hike solo.
My work vacation time resets in the 3rd week of June.
Edit: I have traveled to Spain and Mexico.