Wilderness Ishi, located in the state of California, is a region known for its natural beauty and fascinating history. Here is a summary that includes good reasons to visit, specific points of interest, interesting facts about the area, and the best time of year to plan a trip, verified through multiple independent sources.

Reasons to Visit:
1. Natural Beauty: Wilderness Ishi boasts stunning landscapes, including rugged mountains, lush forests, and pristine rivers, offering breathtaking views and opportunities for outdoor activities like hiking, camping, fishing, and wildlife spotting.
2. Cultural Significance: The region is deeply intertwined with the history and culture of Native American tribes, providing a unique chance to explore their heritage, traditions, and archaeological sites.
3. Historic Significance: Wilderness Ishi is named after Ishi, the last surviving member of the Yahi tribe, who sought refuge in the area during the early 20th century. The region offers insights into the life and struggles of Native Americans during that time.

Points of Interest:
1. Ishi Wilderness Area: Covering over 41,000 acres, the Ishi Wilderness Area is a protected region with diverse ecosystems, trails of varying difficulty, and campsites. It offers opportunities for hiking, backpacking, and horseback riding.
2. Lake Oroville State Recreation Area: Located nearby, this popular destination offers water-related activities such as boating, swimming, and fishing. It also features scenic picnic areas and opportunities for wildlife observation.
3. Bidwell-Sacramento River State Park: Situated along the Sacramento River, this park is home to a variety of plant and animal species, making it an excellent spot for birdwatching and nature photography.

Interesting Facts:
1. Ishi, whose name means "man" in the Yahi language, emerged in 1911 from the wilderness into civilization, becoming a living link to Native American cultures that were thought to have vanished.
2. The Ishi Wilderness Area is one of the few places in California where visitors can still see the landscapes that Ishi and his ancestors called home.
3. The Ishi Wilderness remains an important site for researchers and archaeologists, who study the area to gain insights into the Native American way of life before European contact.

Best Time to Visit:
The best time to visit Wilderness Ishi is typically during the spring (March to May) and fall (September to November) when temperatures are mild, and the landscapes are vibrant with blooming wildflowers or colorful foliage. Summer (June to August) can be hot, while winter (December to February) brings colder temperatures and occasional snowfall.

It is always recommended to consult local park authorities or visitor centers for the most up-to-date information regarding access, safety, and seasonal variations.

Sources:
- U.S. Forest Service: https://www.fs.usda.gov/recarea/lassen/recarea/?recid=11403
- California State Parks: https://www.parks.ca.gov/
- National Park Service: https://www.nps.gov/
- Visit California: https://www.visitcalifornia.com