Take Jenny Lake Scenic Drive into the String Lake area. Three lots serve the area; the picnic area is at the farthest lot, which also serves the Leigh Lake Trailhead. The middle lot is the separate carry-in canoe launch, so check which one you need before turning in. Summer use is heavy and parking can fill early; go earlier if this is a priority stop.
The picnic area has lakeside tables, bear-resistant food boxes and flush toilets. Bring your own meal; this is a picnic stop, not a place to buy lunch. Put food and scented items away in the bear boxes when you’re not using them.