Unfortunately, there seems to be a discrepancy in the information you provided. St. Bernard State Park is actually located in St. Bernard Parish, Louisiana, not in the state of Illinois. As such, I will provide you with accurate information about St. Bernard State Park in Louisiana instead.

St. Bernard State Park is situated in St. Bernard Parish, approximately 15 miles southeast of downtown New Orleans. This beautiful park offers visitors a serene and picturesque natural environment to explore. While it may not be in Illinois, St. Bernard State Park still holds plenty of appeal for nature enthusiasts and outdoor lovers alike.

Reasons to Visit:
1. Natural Beauty: St. Bernard State Park boasts diverse landscapes, including marshes, swamps, and hardwood forests, providing visitors with an opportunity to appreciate Louisiana's unique ecosystem.
2. Recreational Activities: The park offers a variety of outdoor activities such as hiking, camping, picnicking, fishing, and boating, ensuring there's something for everyone to enjoy.
3. Wildlife Viewing: Nature lovers will appreciate the chance to spot various wildlife species in their natural habitat, including alligators, birds, turtles, and more.
4. Historical Significance: The park is located on the site of an old plantation and offers a glimpse into the region's history and cultural heritage.

Points of Interest:
1. Nature Trails: St. Bernard State Park features several hiking trails, allowing visitors to immerse themselves in the natural beauty of the park while observing the local flora and fauna.
2. Fishing Pier: Anglers can enjoy casting their lines from the park's fishing pier, which extends into the marsh and offers a chance to catch various species of fish.
3. Picnic Areas: The park provides scenic picnic spots equipped with tables, grills, and restroom facilities, making it a perfect destination for a family outing or a peaceful lunch in nature.

Interesting Facts:
1. St. Bernard State Park covers an area of approximately 358 acres.
2. The park was established in 1971 and has since become a popular recreational area for locals and visitors alike.
3. St. Bernard Parish was severely affected by Hurricane Katrina in 2005, and the park underwent significant restoration efforts to reopen its facilities.

Best Time to Visit:
The best time to visit St. Bernard State Park is during the cooler months, from October to April, when the weather is more comfortable for outdoor activities. Summers in Louisiana can be hot and humid, making it less ideal for some visitors.

Please note that it's always recommended to verify this information across multiple independent sources, as park details and specific attractions may change over time.