TL;DR: Is tourism=picnic_site the non-overnight equivalent of tourism=camp_site or tourism=camp_pitch?
In my area, it is common to take an evening or day away at a state or federally run “Day Use Picnic Area”, consisting of, at a minimum, a picnic table. In a mountain setting, it is common for there to also be a firepit or grill, and in a beach setting, it is common for there to also be a shade pavilion. The area likely has 1 or more sets of toilets, an associated parking lot, and possibly some drinking water spouts scattered among the sites.
According to the wording used on signage and websites, the single reservable unit is a “site”, and a collection of sites is a “picnic area” or “recreation area”. A single site can be designed to accommodate as few as 8 people at a single table, or as much as 100 people at a collection of tables (example).
Looking around on the map, I see both the “site” and the “picnic area” mapped as tourism=picnic_site. This feels incorrect, as they are conceptually different things on different scales. We differentiate between these two scales for camping with tourism=camp_pitch for the reservable, individual unit, and tourism=camp_site for a collection of tourism=camp_pitch. So is tourism=picnic_site the equivalent of =camp_site or =camp_pitch, and what tag should be used for the other one?
Before anyone asks, yes, I am aware of leisure=picnic_table. I find this not a valid solution since large group “sites” include multiple picnic tables