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There are two National Wildlife Refuges along the Platte River in western Nebraska, North Platte and Crescent Lake, as well as the Rainwater BasinWetland Management District in south central Nebraska, also on the Platte. I'd start by getting in touch with these entities and see what programs, guides or walks they offer during Sandhill Crane migration season. Besides these (likely free) programs, the Audubon Society offers a $25 tour at the Rowe Center near Kearney. There are also about two dozen state parks along the Platte River. There is certainly no shortage of places to view the crane migration for little or no cost. Make use of the public facilities you (and others) have paid for.

More generally, make use of the parks, forests and refuges all along your travel.

AZBuck