Economic trekking spots

Mt. Takao and Kamakura are spots that are popular to go trekking. And it's only about 1 - 1.5 hours away from Tokyo, maybe about 1,000 yen (each way) by train. Both are good for beginners.

The Chichibu Tama Kai National Park and Mt. Tsukuba are good for hikers with a little more stamina.

See this website for more. https://tokyocheapo.com/lifestyle/terrific-tokyo-hikes/