Going from Shinjuku-station to Tokyo-station with Yamanote-line. From there we go for a walk....starting at Palace East Gardens, thereafter to Koishikawa Korakuen Garden and at last to Rikugien Garden, where we can take Yamanote line back to Shinjuku. Do you think it is do-able ? We don't look at a mile/km more or less. Without the parkwalkings I think it's about 7 km/5 miles, is that right ?