The Hakone Freepass is an economical and convenient option for you to visit and explore the Hakone area. The Freepass is sold at any Odakyu Line station (ex.Shinjuku, Odawara), and Hakone Yumoto Stations and so on. It allows you ride on the buses, trains, sightseeing cruise, and ropeways in the area. The Freepass also gives you discounts at select shops. The tickets can be purchased for two or three-day durations. Using the Freepass is simple. Just show your pass when you are getting on or off the different forms of transportation, that is it!
https://www.odakyu.jp/english/passes/hakone/