Visit anytime during daylight hours, walk the trails, and enjoy the diverse habitats and the birds they attract. That's what this preserve is devoted to doing: attracting migratory birds. See: http://www.wisconsinbirds.org/migratory/forestbeach.html
Right now, many summer wildflowers are in bloom (Penstemon, black-eyed susan, coneflower, tick trefoil), with many more due to flower in the peak month of August. That's also a great time to visit to see shorebirds and other waterbirds. September and October are becoming better known here for good raptor flights, and we have the Bill Cowart Memorial hawkwatch platform dedicated for that purpose. As autumn approaches, I'll be asking for volunteers to help monitor and count raptors on good raptor flight days. Especially good numbers of Merlins have been seen in some autumns, with 15 total raptor species seen. Get in touch with me if you're interested (e-mail address below). Many other landbird species are found here as well, with a total of 235 species found here in just the last 4 years.
See also: http://owlt.org/visit-our-preserves/forest-beach-migratory-preserve
When you plan a visit, check in with us (when we're here) on the lower east end of the main building, in the office of the Western Great Lakes Bird and Bat Observatory (WGLBBO; see http://wglbbo.org/about-us). If you want to use or browse in our ornithological library, check with me for times or arrange a time when you'd like to visit. We loan ornithological books or journals, or you can read while you visit. (Contact Bill Mueller, Western Great Lakes Bird and Bat Observatory, firstname.lastname@example.org ). Directions to Forest Beach and the Observatory: http://wglbbo.org/map-directions