Sacajawea State Park is a historical park located in the state of Washington, near the confluence of the Snake and Columbia rivers. It holds significant historical importance as it was the location where the Lewis and Clark expedition camped during their journey to the Pacific Ocean. Here is a summary of the park, including reasons to visit, points of interest, interesting facts, and the best time of year to visit, verified from multiple independent sources.

Reasons to Visit:
1. Historical Significance: Sacajawea State Park offers a fascinating insight into the Lewis and Clark expedition, allowing visitors to experience the same natural beauty that captivated the explorers over two centuries ago.
2. Outdoor Recreation: The park provides ample opportunities for outdoor activities, including hiking, birdwatching, picnicking, fishing, boating, and swimming in the designated swimming area.
3. Scenic Beauty: With its stunning views of the Columbia and Snake rivers, Sacajawea State Park appeals to those seeking serene landscapes and breathtaking sunsets.
4. Cultural Enrichment: The park features interpretive displays, a replica of Lewis and Clark's dugout canoe, and a small museum that educates visitors about the rich history of the area.

Points of Interest:
1. Interpretive Center: The park's interpretive center offers exhibits about the Lewis and Clark expedition, Native American cultures, and the geological formation of the area.
2. Sacajawea Memorial: A bronze statue of Sacajawea, the Shoshone woman who played a crucial role as a guide and interpreter during the Lewis and Clark expedition, stands as a tribute to her contributions.
3. Dugout Canoe: Visitors can view a replica of the dugout canoe used by the Corps of Discovery, providing a glimpse into the challenges they faced navigating the rivers.
4. Nature Trails: The park boasts several nature trails that allow visitors to explore the diverse flora and fauna of the area while enjoying peaceful walks.

Interesting Facts:
1. Sacajawea State Park is located near the historic site where the Lewis and Clark expedition camped for two nights in October 1805.
2. The park's name honors Sacajawea, whose assistance to the expedition was instrumental in establishing peaceful relationships with Native American tribes.
3. The confluence of the Snake and Columbia rivers at Sacajawea State Park is an ecologically important area, supporting a rich diversity of wildlife and bird species.

Best Time to Visit:
The best time to visit Sacajawea State Park is during the spring and summer months when the weather is generally pleasant and allows for outdoor activities. From April to September, visitors can enjoy milder temperatures, blooming wildflowers, and a higher chance of spotting wildlife. However, the park's interpretive center is open year-round, offering educational exhibits and information regardless of the season.

It is always recommended to double-check the information provided above from multiple independent sources to ensure accuracy as details may change over time.