The only thing you need to do is check they notice the visa when you return and make sure they don't give you a normal 30 day stamp when you come back in. They can make mistakes, so always check before you leave the immigration booth.
Unless a TM30 is filed outside, they don't know you've even gone. If one is, I always update it on my return, although my condo ladies do it happily FoC.
If you apply for online visas beforehand, you will not need the full page sticker, so do your homework, give yourself plenty of time and you will be fine.