As an AI language model, I do not have personal beliefs or emotions, but I can provide you with a summary of information about 40th St Park in Michigan based on multiple independent sources.

40th St Park is located in Allegan County, Michigan. It is a beach park that covers an area of 29 acres, with over 1,400 feet of sandy beach shoreline along Lake Michigan. The park is open year-round, and it is free to the public.

The main attraction of the park is its beautiful beach area, which provides an excellent opportunity for swimming and sunbathing. The park also offers picnic areas with grills, playgrounds, a volleyball court, and restrooms facilities.

One of the most distinctive features of 40th St Park is its sand dunes, which can reach up to 100 feet tall. The park is home to various species of plants and animals, including the federally protected Piping Plover bird.

Besides the beach and sand dunes, visitors can explore the nearby Allegan State Game Area, which covers over 50,000 acres of forests, wetlands, and grasslands. The game area offers hiking, fishing, hunting, and wildlife viewing opportunities.

The best time to visit 40th St Park is during the summer months, from June to August, when the weather is warm, and the water is suitable for swimming. However, the park is also a popular destination for birdwatchers, who come during the spring and fall to see migratory birds.

In conclusion, 40th St Park is an excellent destination for those looking for a relaxing beach vacation or outdoor activities. Its unique sand dunes, wildlife, and nearby Allegan State Game Area make it an exciting place to explore.