I agree with both of the previous posts. One course near me is on a very small plot of land, ~3 acres or so. They actually have 18 holes on it, but a lot of the holes are shared holes, i.e. hole 1 and 10 share the same basket, but they have different teepads. Though of course ideally, they'd have 18 separate baskets, it works out pretty well with the 12 or so that they've got. So if you can put in alternate teepads, that'll go a long way. Only suggestion I have as far as that goes is to have alternates that are really DIFFERENT. There's a few holes at the course I mentioned where the second tee is just a couple feet behind the first one. It makes the shot slightly different, but not enough to really be interesting.
Also, if you do put two baskets on the holes, be judicious with them. If one basket is directly in the line of normal play to get to the other one, it can be annoying, IMO. Sure, it's another obstacle to go around and whatnot, but the end result is just kinda sloppy feeling course design. As long as they're nicely separated though, that's cool.