A couple of decades ago, a veteran GC builder remarked, "I fear we're at a point where golf paths have to be designed around. Starting from scratch is much easier that after-the-fact. A majority of every punchlist is centered around CP issues. Don M. gave you CP-101. Here are a couple of others: Pay attention to cross-slope - flat paths, even going slightly up or down hill don't drain well and are apt to have bird-baths. If you place gravel under them for a base, be aware that it will act as a drainage conduit so you'ld better extend a drain pipe to the low point to pick it up or it will leak out into the rough where you will have a perpetual mud hole and never figure out why. (the low points are also the natural on/off points).
Keep the curves slight or the insides will get worn. Drive a pickup truck at 10-15 mph w/door open and use a piant gun to mark left edge.
Think of them as Service Paths for maint rather than buggies. This will keep them further away - as it should be.
Raise the price of buggy rental to offset. Pay as you go. Don't mandate walkers to subsidize. I had a public course add a $1 surcharge to every cart rental and they put that in a Path Extension fund.
Start at the farthest point out and work back to entrance. That way you won't tear up good path in the process.
8' min. Sod the edges, seed never works well.
Adrain, this is a costly endeavor. You may wish to just let the few out and deal with damage. Most cart damage is from spinning tires. Have your mechanic limit their speed to "really slow" like 5 mph which is twice walking speed but less than the 12-15mph the factory sets them at. Raise the cart fee in winter/spring due to damage. Most who threaten to go somewhere else will not complain about price and if they do, just let them know it's on them.
Since a gravel base is usually needed, I suggest putting one in first and seeing if you can live with it. Just make sure you have a tractor and box-blade to run over it once a week to keep it looking neat (it will wash and rut without attention) If you can get asphalt grindings, the darker coler blends better than white or buff stone. Some clubs have used Red granite chips to blend - it looks pretty nice.
The funny thing is, when CP only, they will probably end up walking more back and forth than if they walked tee to green- but would never believe you. You will generate a fair amoun of topsoil, so if you plan things properly, you can use it to help hide the fairway side of the path (it has to go somewhere and adjacent is cheapest) and sod the whole endeavor with the sod from the path alignment.
Melvin, cool buggies, I'd play there just to drive one