You are correct about your permit being honored here. When you're on the Strip, easiest just to conceal going in and out of casinos. They'll hassle you if you open carry. Everywhere else, open carry is a non-issue (aside from the random anti- business). Town Centre or Square or whatever on LV Blvd is anti-OC, FYI. Here's the good part: you can drink while carrying in Nevada!
Also, signs do not have the force of law, so you can walk right past them if you're so inclined.
I humbly offer up NevadaCarry.org for your edification.