You can have nice things like this till they get abused.
It appears that the laws where I live are quite similar to those in Estonia in this aspect, and I have never heard of any real abuse.
But the other problem in the US is that we don't have just one culture. Anyone who talks in public advocates the same pack-it-out approach to trash. That's the practice in the self-consciously outdoorsy subculture. But the people who leave trash in public campgrounds, I suspect anyway, live in an entirely different world with no realistic communication channels between them. Application to national politics is left as an exercise.
Really? I'm not saying you're wrong, but it's much easier for me to think of counterexamples than supporting examples. Hikers leave garbage on trails all the time. Even dog owners let their pets leave little presents for other people to take care of. I love right to roam laws, but I can see the other side too. I think we have to weigh the tradeoffs and accept that there's a cost—one that may be outweighed by the benefits, surely—not deny that any costs exist.
That can be interpreted both ways. Keeping people off the land is also a type of abuse, as is misuse of the land by a large amount of people roaming there.
Improved land had has an investment in time and money to make it productive one way or another.
Like If someone bought and put a fenced in corn field or tract house in Yosemite valley, it would be “improved land” by the usual definition
Here,in Estonia, everyone can walk on anyones land unless it is someones private home or its surrounding yard (lawn, fields, etc).
You can walk, hike, collect berries and mushrooms for private use everywhere (unless it is on an industrial scale).
If your piece of land is on a sea or lake side or a river, then you must provide access to it, 5 metres from the waterline must be acessible for everyone and can't be fenced off.
I once saw a news item from the uk where someone from Latvia was collecting mushrooms, the land owner didn't like this and the mushroom gathrer had to pay a big fine. Even though nobody was stolen from since the people in the uk don't know anything about wild mushrooms and thry would just rot and go bad. Kind of absurd