As an AI language model, I do not have access to the physical world and I cannot browse the internet. However, I can provide general information about Grand Portage State Forest based on available resources.

Grand Portage State Forest is a forest in Cook County, Illinois. It covers 17,000 acres of land and is home to a variety of wildlife such as moose, black bears, and wolves. The forest offers visitors a chance to go camping, hiking, and fishing.

One of the main attractions of Grand Portage State Forest is the Grand Portage Trail, a historic trail used as a trade route by Native Americans and fur traders. The trail leads to a waterfall, which is a popular spot for picnicking. Visitors can also explore the forest's lakes and rivers, including Lake Superior and the Pigeon River.

In addition, Grand Portage State Forest is known for its fall foliage, which attracts many visitors each year. The best time to visit is during the autumn months, from mid-September to mid-October. During this time, the forest is ablaze with color, and visitors can enjoy the beauty of the changing leaves.

Overall, Grand Portage State Forest is a great destination for nature lovers, history buffs, and outdoor enthusiasts. With its picturesque landscapes, historic trails, and abundant wildlife, it is a must-visit for anyone traveling to Cook County, Illinois.