Is Jupiter as opaque as it looks?
What you see are clouds, big clouds, and these are as opaque as the cumulus clouds on Earth. The pale bands are ammonia clouds and the darker bands are ammonium hydrosulphide clouds. The ammonia clouds form above the hydrosulphide clouds In the polar regions you can see deeper, down to the water clouds that lie beneath the ammonia clouds.
There is a layer of atmospheric haze that is above the cloud layers, it is easiest to see in the polar regions.
The difference between the layers is on the order of 50-100km.  If you were in a cloud, your visibility would be pretty limited and as you descended through 50km of cloud, it would get pretty dark. But like on Earth, there would be gaps and clear bands, between the layers of cloud.