Sardaddy, You can go liberty/leave/liberty. You just can't go leave liberty leave. In your above scenario, I would certainly put in a no duty/out of bounds chit(if I was traveling past whatever the certain distance is) and then submit leave for the 5 days. This would give you 9 days of off time for only using 5. If I have a lot of leave saved up, then I don't mind burning it and I'll put it in for all the days but for people who are short leave, you can certainly spend 5 days of leave for the 9 days if your duty section/rotation can handle it. You can even snivel for an oncoming duty on the next Monday and get an extra half day to recover/unpack before you head back to work. There are no regulations that you would be skirting and nobody looking the other way. That is all perfectly legal.
Now, if you do that too many times, people may start to get upset because they are picking up the slack while you are gone, but once a year or two should be fine. Everybody in my shop wants everybody to take as much earned leave as they would like and we are all happy to pick up the slack. We all know our time will come where we may need or want to take a chunk of leave.
Nobody I work with wants to screw our duty rotation or work schedule. We try not to take as much leave during transfer season and busy times. Typically the guys without families choose to volunteer for duty on family holidays like Christmas and I try to volunteer for duty on holidays that single people would like to go to parties for such as New Years or St Patricks day.
Leave will be explained in boot camp and each unit/shop has their own vibe on how they use it. There are hard rules ( like no leave/liberty/leave) and unit specific rules such as what to do if you are traveling more than a specified distance away( I've seen 200 or 250 miles as a rule for out of bounds). It may sounds complicated but it makes sense once you're here.