Sand and Solitude. Indiana Dunes National Park hugs 15 miles of the southern shore of Lake Michigan and has much to offer. Whether you enjoy scouting for rare species of birds or flying kites on the sandy beach, the national park's 15,000 acres will continually enchant you. Hikers will enjoy 50 miles of trails over rugged dunes, mysterious wetlands, sunny prairies, meandering rivers and peaceful forests.