Are they willing to wait in line with everyone? For me, that's more fun than sitting outside, not knowing how far through line the rest of the party is, and having nobody to talk to. I can't ride things that induce motion sickness (i.e. RnRC, EE), but I'll wait in line with the rest of my group and then take the chicken exit. Much more fun.
If they're not able to stand in the lines with you, it varies ride by ride, but with most of them it's fairly easy to find the exit and wait nearby. More modern rides will have seating areas strategically located near ride exits. Older ones don't, but many of those have gift shops at the exit (ToT, Pirates, Space, etc).
The rides that don't have convenient places to wait at the exit tend to be the rides almost anyone can ride anyway, like the Fantasyland dark rides.
If you can offer some more specifics, you'll get more helpful answers too