It's worth noting that neither New York nor Pennsylvania have bans on non-essential travel any more (and NY might not have ever had a strict one... our orders focused more on business closures, we're not like Europe where one needed a government permission slip to leave the house), and neither state is in the list of states where the pandemic is getting worse. NY's infection rate is actually the lowest in the country. So, leaving aside whether one should clinch roads or take "daytrips" to parks, I'm not sure what law is actually being violated here.
And that's the thing, technically Ontario has no laws against this and arguably never had any such laws. HOWEVER, does that make it the right thing to do even though it's not illegal. Here in Canada, you can smoke weed legally but is it something you should do? That's the kind of thing I mean.
Ontario never did have any restrictions from entering the province from another province, unlike say Newfoundland where a 14 day quarantine must occur after you enter Newfoundland.
Although you are now just over 600 cases now a day, NYS isn't entirely clear of this yet, Ontario for the past few days has had sub 200 cases each day.
But if you get into an accident and end up in the hospital with other sick COVId-19 patients, you can easily catch it as well.