Since everyone is giving you advice,
Ras ...
Don't forget that you can also go up with your track and have bridges and tunnels and all kinds of stuff ...
However, I've found that the best layouts are the "simple" ones. I like to keep my track on one level and put my scenery at different levels. Actually, you could have your train go into a mountain and use the top of the mountain for your town or Indians or whatever. Your layout's great because you can leave the inside of the "mountain" open at the back for maintenance or to easily retrieve a derailed train.
I've attached a few old photos of a "Christmas Layout" that I put up one year for the Holidays and never changed for about eight years ...
The pictures should give you an idea of what I'm suggesting.
All the best,
Richard
click on images for larger pictures