Of course nobody is going to enforce that outside of closing parks and trails.
The bottom line here is we have enough people in america that are just not going to ever do any kind of lockdown, masks, etc. Just not going to happen. So in the US we are going to simply have to deal with this thing for a long while which sucks. Things will open back up in a month or two but until there is a vaccine we are going to always be taking a risk anytime we go out and it will be up to us to decide what level of risk we are comfortable with. Businesses like disney are going to have to adapt and make people feel more comfortable in order to get more businesss. There are going to be people that say "I'm not a wimp. I'd be back today if I could" but also people who will be hesitant. I'm in the latter. I have recovery reservations for september and season tickets for auburn football in the fall. As of today I'm nervous about going to either. While I'd likely be mild to moderate from hearing people talk mild to moderate is still a horrible time. I don't want to deal with that if I can avoid it.
So Disney/bars/restuarants are going to need to do things to help make people feel safe. We can argue how effective they are but people are going to want that. Same goes for football and the like.