100YEN BUS at Shinjuku Station
it circles the famous spots and popular hotels around the SHINJUKU station, starting from SHINJUKU Station West with cost of only 100 YEN
1 day pass is also available for 300 YEN.
It runs every 10 to 15 min during weekdays and every 12 to 30 min during weekends.
Be careful to get Shinjuku Gyoen National Garden, it runs every 30 to 60 min from 10 a.m. to 3p.m .
