Hakone - Lake Kawaguchiko - Tokyo

Dear Guys
I plan to visit Japan next month with family
We will arrive at Haneda airport , then continue to Hakone , spend one night , and go to Lake Kawaguchiko for one night .
After that back to Tokyo

Please assist how is the most easy way for this route

Car rent if you have IDP.
https://nissan-rentacar.com/english/vehicles-rates/
https://nissan-rentacar.com/english/guide/qualification.html

For public transport then buss would be the fastest, cheapest and easiest.

From Haneda to Hakone, take the Odakyu Hakone Highway Bus,
http://www.odakyu-hakonehighway.co.jp/common/pdf/english.pdf

Then when going to Lake Kawaguchi:
Take the Hakone tozanbus from Hakone-yumoto to Gotemba.
https://www.hakone-tozanbus.co.jp/english/index.html

Then from Gotenba to Kawaguchi Station take the FujiKyuko Buss.
http://bus-en.fujikyu.co.jp/route/detail/id/1/


Then last from Kawaguchi to Tokyo you have a lot of bus choices. One could be this one.
https://www.highwaybus.com/gp/foreign/frgSelectLine?lang=en