Crossing the red Megane Bridge in Odawara Castle Park will bring you to the castle grounds, where you'll find wooden benches with tables.
This area seems to be called the "Ōkoshikake-ato" site.
Introducing the rest area "Odawara Station | Odawara Castle Ruins Park, Moya Kuruma Area | Rest Spot" at 12 min walk from odawara Station.
Introducing the rest area "Odawara Station | Odawara Castle Ruins Park, Moya Kuruma Area | Rest Spot" at 12 min walk from odawara Station.