All the walks look good, depends how far you want to walk, although most fairly short 5 miles ish.
Willow beach we went right towards the dam. I'm a learner so we didnt go too far, just over an hour. Also went to temple bar we didn't go in, but were told to go right into the canyons. If you got there look for the carp, the guy that runs the boat yard has a small office on the deck and as soon as you go near it all the fish appear as he feeds them. Be aware they have the Quagga mussels there.
Canyon Trails is a decent park, gravel pull thru mostly, full hook up and cable, small pool and hot tub and big laundry. Good Sam discount think we paid either $31 or $35 a night. Family run business. About half an hour to willow beach, and an hour and a half to valley of fire.
There are some good off road trails near Boulder City too if you are interested
http://offroadinghome.blogspot.co.uk/2010/08/new-9-boulder-city-nevada-trails.html