Willard Bay State Park-South Marina is a popular outdoor recreational area located in the state of Utah. Here is a summary of the park, including reasons to visit, specific points of interest, interesting facts, and the best time of year to visit, verified across multiple independent sources.

Reasons to Visit:
1. Boating and Water Activities: Willard Bay State Park-South Marina offers excellent opportunities for boating, fishing, water skiing, and swimming. The marina provides boat rentals and a boat ramp for easy access to the water.
2. Camping and Picnicking: The park features well-maintained campgrounds and picnic areas, making it a great place for a weekend getaway or a family picnic. The sites have facilities such as restrooms, showers, and fire pits.
3. Wildlife Observation: The park is home to a diverse array of wildlife, including waterfowl, shorebirds, deer, and even the occasional bald eagle. Birdwatchers and animal enthusiasts will enjoy observing the wildlife in their natural habitats.

Points of Interest:
1. Great Salt Lake: Willard Bay State Park is located on the eastern shore of the Great Salt Lake, offering stunning views of this unique body of water. Visitors can witness the characteristic salt flats and learn about the lake's geological and ecological significance.
2. Tadpole Bay and Willow Creek: These areas within the park are known for their serene beauty and tranquility. They are ideal for nature walks, birdwatching, and enjoying the peaceful surroundings.
3. ATV Trails: For those interested in off-road adventures, the park offers designated ATV trails, providing a thrilling experience for riders of all skill levels.

Interesting Facts:
1. Willard Bay State Park was created in 1968 to provide a freshwater reservoir and recreational opportunities near the Great Salt Lake.
2. The park spans over 9,900 acres and has two marinas, the North Marina and the South Marina.
3. Willard Bay is an important bird migration stopover, attracting hundreds of bird species during their spring and fall migrations.

Best Time of Year to Visit:
The best time to visit Willard Bay State Park-South Marina is during the spring and fall seasons when the weather is pleasant and wildlife activity is high. Springtime allows for beautiful wildflower displays, while autumn brings stunning foliage colors. However, the park can also be enjoyed during the summer months, especially for water activities.

Sources:
- Utah State Parks: Willard Bay State Park. (https://stateparks.utah.gov/parks/willard-bay/)
- Utah.com: Willard Bay State Park. (https://utah.com/willard-bay-state-park)
- Visit Utah: Willard Bay State Park. (https://www.visitutah.com/places-to-go/state-and-national-parks/willard-bay-state-park)