In that case Penge West has more than the normal 5 people who use it off-peak!
TfL have produced a leaflet called "Up and Running" which suggests venues for passengers to visit along the line.
West Croydon - Fairfield Halls.
Norwood Junction - South Norwood Lake
Anerley - South Norwood Country Park
Penge West and Crystal Palace - The park
Sydenham - Mayow Park
Forest Hill - No surprise, it's Horniman Museum and Gardens!
HOP - One Tree Hill
Brockley - Rivoli Ballroom
NX/NXG - Telegraph Hill
Surrey Quays - Greenland Dock
Canada Water - Stave Hill
Rotherhithe - Brunel Museum
Wapping - Wapping Old Stairs
Shadwell - Shadwell Basin Outdoor Activity Centre
Whitechapel - Whitechapel Art Gallery
Shoreditch High Street - Brick Lane Market
Hoxton - Columbia Flower Market
Haggerston - Geffrye Museum
Dalston Junction - Ridley Road Market.