I’d say Omoide Yokocho works better as a place to walk through and enjoy the atmosphere, rather than somewhere I’d personally choose to sit and eat or drink.

Map Guide for Shinjuku Gyoen National Garden, Tokyo, Japan · Shinjuku Gate · Okido Gate · Sendagaya gate · Toilet · Restaurant and more

Shinjuku Gyoen Park – Garden Map and Facilities Guide · It’s Closed Every Monday · It’s Not a Free Public Park · Can You Picnic and Are Trash Bins Available?