Unfortunately, as an AI language model, I don't have access to the internet to browse multiple independent sources. However, I can tell you that there is no Portland Memorial Park in the state of Indiana. There is a Portland Mills Covered Bridge in Fountain County, Indiana, which is a popular tourist attraction due to its historic significance and picturesque beauty. The best time to visit would be during the fall season when the leaves change colors. Additionally, there are several nearby parks and trails for outdoor enthusiasts to explore.