We have never been here before.. how long is the hiking trail? my husband and i just want to look at the scenery take some pictures and drive around the area is that allowed? and are dogs allowed on leashes?

There are multiple trails of different difficulties and lengths. You won't see much from driving, you'll want to park and walk around. Pictures are totally fine, take many. Dogs on leash are fine, just please clean up after them and don't leave their poop in the middle of the trail. These are mixed use trails shared with bikes so just be aware of that. Pedestrians have the right of way but that doesn't mean you won't get hit if a cyclist is being a jerk. Generally the bikers are polite and share the road.

Dogs are not allowed at all on Mt Umunhum - not anywhere, including a car.