That is correct, the city bus will drop you off at the entrance to the Mendenhall park. It's a flat 1.5 miles walk on a paved walk to the visitor center from the entrance. The trail out to Nugget Falls is just to left of the visitor center, can't miss it. That path is a paved path, fairly flat. It'll be like a interstate freeway with people walking out to Nugget falls. Be sure to bring your senior National Park pass, it'll save you $5 on the bus ride should you use the White or Blue bus.