There are three major reservoirs in Maryland. They closed them to hiking, kayaking, horseback and fishing.
So, millions of people are out of work with uncertainty. Who knows how long unemployment checks are going to take to start processing. Many of them may be looking for alternative sources of food.
Our reservoirs are generally off limits anyway (for security reasons); I suspect any that were accessible before (as part of state parks) are still accessible.
I suspect it is much safer to have people out in the woods with their “quarantine roommates” than in dense neighborhoods - though they should probably close picnic areas where people would be on top of each other.