Hi all, I am new and having fun here and with Bryce.

I have a question about making things look far away. I want to make some mountains look like they are miles away, but I don't want to have to drag them miles away from the camera. how can I do this?

You can thicken the haze and fog in the atmosphere editor

A little tip i use is to drop a cloud plane angled at 90degrees in front of the rear scenery.

Quote - I want to make some mountains look like they are miles away, but I don't want to have to drag them miles away from the camera.

 
The only natural way to do it is to drag them 'miles' away from the camara, Bryce's fog looks so much more natural than adding cloud planes, although it is still a good idea, as an addition.
What I do to get a decent distance in Bryce, is to create a scene, when i'm happy with it, expand the entire scene maybe 4 times or more from what it was. This gives great levels of distance fog.

Thank you all for the replies!

I agree with dhama, here.  Only need a few mouse clicks and a quick push or two to send the mountains into the distant background.  Sometimes the fog effect will already be there for you after doing this.  Have some fun experimenting and glad to see you have chosen Bryce, and a hearty welcome.  See my render:

http://www.renderosity.com/mod/gallery/index.php?image_id=1779084&member

In general, in 3d graphics, the easiest way to make things look like they do in real life, is to recreate the real life conditions as accurately as possible.
Adopting this principle in your workflow early on will maybe be difficult at first, but it will give you a good insight in what you're doing. Eventually it'll help you create whatever visual look you're after more easily and efficiently.
It will also mean your textures, models, light setups etc. u make can be more easily re-used in future projects if so required. 

Basically, for ur current problem, this means distant mountains, should in deed be located in the distance. That way the hazy effect builds as you would expect in real life.
In some real life scenario's you will also find some low altitude clouds between the viewer and the mountains in the distance. This is why the earlier suggestion of cloud planes can also work great in some situations.
Actually making the mountain objects very large (like real life mountains) works great as well, but i guess thats required anyways if u put them far, far in the distance.

Been ages since I used Bryce, but similar to what  rj001 says, sort of, if you take a photo of a real clouds that would look ok on mountains, so you need the clouds ot have been on far away  to get correct shadows etc

CLouds that are up close show too much of their bottoms and shadow and would look fake, you'd need ones obviously far away that would fit into a far off scene.

you can edit that picture in a 2d editor (Photoshop, paint shop pro etc), crop out just the clouds to leave the rest transparent, save as a .tif or similar format with transparency (.png or .psd perhaps)and use as a picture image.

Put that in front of your mountains, so you have good looking clouds in front of the mountains.

Make sure you set the Sun in Bryce so it roughly fits the angle of light on the photo clouds!

Adding a little depth of field of blur can hide imperfections
:)

Hi F3Rider!!

If you put a sphere around your entire Bryce scene, you can put a atmosphere layer on it of your choice (this gives some wicked effects).  Then you can drag your mountain even further into the background, and it gives it that hazy look.  Also if you put light beyond the sphere, this gives some great effects as well - I always have fun doing those.