Philip

Can't vouch for the MX section, but this park regularly holds different kinds of events - from BMW riding schools to Enduro/MX races. Good place for mixed kind of riding. There are a few enduro and trail sections too, but nothing too big. Renting bikes seems possible but condition of the bikes is unclear. For hard enduro its probably better to go to other areas, but I'd give this location a try when there is an event.

Easy to ride and partially paved/gravel rindo, but massively long with amazing views. You'll be riding along ridgelines.

Very large trial area with wide open areas great for beginners as well as many boulders, rocks and technical sections for advanced riders.

Massive riding park for both trial and enduro. Biggest rideable mountain area I know in Kanto. The owner is a professional beta trials rider and is very helpful and also offers repair services (at least for anything beta related). For a fee you can store your bike inside a container at the park, but the spots are quickly taken. This place also regularly hosts a number of riding events.

トライアルの練習に最適な美しい渓谷で、東京都心から1時間半以内とアクセスも抜群です。オーナーは定期的にローカルイベントを開催しており、自身もトライアルを楽しむ、とてもクールな方です Beautiful valley to practice trial and good access within 1.5h from center of Tokyo. Owner regularly organizes local events and rides trial himself - very cool guy!