Itoshima City recently published a walking map and series of mountain hiking maps. All are free of charge and available online as PDFs.
The walking map contains 13 routes, along with tips for walking. There are four separate hiking maps, covering four different routes:
1. Northwest Itoshima Route: Kaya-san (Mt.), Tateishi-yama (Mt.), Hi-yama (Mt.)
2. East Itoshima Route: Takasu-yama (Mt.)
3. Southeast Itoshima Route: Iwara-yama (Mt.), Rai-zan (Mt.)
4. Route 4: Nijo-dake, Me-dake, Uki-dake, Tonbo-yama (Mt.).
You can pick up the maps for free at JR Chikuzen Maebaru Station and Itoshima Kanko Kyokai (Sightseeing Association), but be quick – copies are limited! Official HP: http://kanko-itoshima.sakura.ne.jp/ja2/?p=19497