I've lived in Vegas for almost 10 years and I never miss an opportunity to visit this State Park. It's $80 for an annual fee (worth it if you travel to other parks or even come here more than once a month)...otherwise it's $7 for a vehicle. & I believe $1 if you park outside the entrance and walk in. (which is legal as long as signs permit)
There are many hiking trails along the 30 minutes scenic route drive. My favorite is Ice Box which is amazing in the spring when snow has melted and temperatures are on the rise in the valley.
You can bring your dog, but please pick up after. Yes it sucks to carry poop around on a hike since there are no trash bins but that's the price you pay for bringing your animal that doesn't belong in that environment.
Lots of trash has been left behind recently as well - water bottles, beer bottles, and other trash. Please care about the environment and our earth. We only have 1.