There are a number of nodes with "leisure"="picnic_site" in the vicinity. This tag is deprecated. They are also tagged with tourism=picnic_site which is the current version. However, since there are so many here I believe that the right tag might actually be leisure=picnic_table if it is just a table (see https://wiki.openstreetmap.org/wiki/Tag:tourism%3Dpicnic_site for more details)