Paulette,
I think maybe you want to use hyperfocal focusing in that situation. It's kind of difficult to explain without actually showing you, but I'll try...
If you look at your lens from the top, you should see some hyperfocal marks and lines (see attached image).
The hyperfocal numbers will correspond to your f-stops, and there will be 2 numbers for each f-stop - one on the left and one on the right.
Meter the light in the area you want to shoot and figure out what f-stop you will be using.
Focus your lens at the farthest point you want to be in focus and make a mental note of the distance. You should have meters, feet or both on your focus ring, and the distance you are focused at will be lined up with the center mark on your hyperfocal scale. Repeat for the nearest point you want to have in focus.
Set your farthest distance at the left hyperfocal mark that corresponds with the f-stop you'll be using (on some cameras I think this may be reversed and the farthest distance will be on the right instead of the left?). All of the distances that fall between the hyperfocal marks for the f-stop you'll be using will be in sharp focus.
With your farthest distance set to the left hyperfocal mark, if the closest distance you chose falls outside your right hand hyperfocal mark, you will need to choose a smaller aperture (bigger f-stop number) or limit your shooting area a bit more.
NOTE: When you look through your viewfinder, things will not LOOK like they're going to be in focus, but it DOES work - trust me!
The best way to prove this effect (if you want to test it in advance) is to go out and find some beautiful scenery on a nice bright f-16 day. Focus as you usually do for scenery and take a shot, then refocus by setting your infinity symbol on your left side f-16 hyperfocal mark and shoot the same scene again. You'll just be amazed at how much sharper the hyperfocal shot will be...!