start at the Saijoji Parking Lot, Daiyucho, Minamiashigara, Kanagawa 250-0127. Planning with google maps works, for me it meant to take the train and then 2 buses. (2h30m from home for me)
right at the start, there is a nice Buddhist temple area
then go to Myoujingatake top, might take 2 or 3 hours, if you do not come off the path as I did
no stores at the top, but depending on weather nice views
then way back on the other side of the mountain to bus station 箱根登山バス 宮城野営業所, takes 150min
then via bus and train back to Tokyo, took 2h30m for me
The mountain is ok, but hard to reach for me. For example 鍋割山 in the vicinity is much better to reach and has also nice views.
a 3.5-5.5 hour trip from Okutama via Honnitasan to Hatonosu station
West of Tokyo
高尾山/Takao-san
take train to Takaosanguchi(高尾山口), 60min from Shinjuku
then ropeway, or lift, or climb to Takao-san. Takao-san is not very challenging, but a nice start, and along the way there are temples and shrines. When at the top of Takao-san, one can also decide to go further: to one, two or even 3 mountains nearby. See Jinbasan notes.
There is a nice bath inside the Takaosan-guchi-trainstation.
a nice 4 hours trip, seeing Sagamiko lake, climbing Sekirouzan, Onsen visit possible
North of Tokyo
Tsukuba-san/筑波山
take train to Tsukuba trainstation(つくば駅), 60min from Tokyo
then enter the shuttle bus (筑波山シャトルバス) to 筑波山神社入口(Tsukubasanjinjairiguchi), takes 36min
then either climb up (90min) or take the cablecar (5min)
from there you can eat, and visit both mountains (takes 15min to each), or walk other routes
When going down again via cablecar or by foot, there are several Onsen. 3 are part of hotels and only open for non-hotel-guests until 3pm. A small onsen exists and is free for normal customers, also after 3pm.
Tanigawadake/谷川岳
From Tokyo, take the train to Doi-station/土合駅, takes ~3hours
from there, go to 谷川土合口駅 (24min walk, or by car)
from there a ropeway and chairlift go upwards
from the plateau it takes 3 hours of walking to the top of 谷川岳. Good shoes recommended.
Tokyo→Gotemba-station (2:15h), bus to Otome Toge bus stop, 120min until Mount Kintoki
OR Tokyo→Ashigara station, 90min walk to Ashigara Pass (足柄峠/Ashigara-tōge), then 90 minutes walk to Mount Ashigara
忍野八海
from Tokyo train to 富士山駅, from there walk 90min to 忍野八海, or bus. The train is crowded on weekend, if possible reserve a seat.
If walking from 富士山駅, one can stop by at the “Fujisansaku Park”, it's on the way and nice. Navigation with Google maps worked nicely for walking directions.