I recently got in a little bit of legal trouble (dui) so my recreation driving is basically going to be gone for a year.  I have 2 batteries, one dual and the other a deep cycle.  What should I do with the batteries since I wont be using them for a year?  I got them last year so they aren't old batteries.  I was thinking about maybe letting my dad use the deep cycle battery on his cuddy cabin boat and can use it to run lights at night when he stays out over night.  Then he can recharge that way it is being used.  Or is it better for me to just let them sit in the garage and just put the charger on them every now and then?  Which is better?

Give them both away and buy new ones when you are legal again.  It will only help the lesson to fix in your brain.

The worst thing you can do to a battery is let it sit around and get discharged because of the lead sulfate plate build-up. Batteries naturally self-discharge 1% to 15% per month (depending on the type) while in storage, and lead sulfation will start occurring when the state-of-charge drops below 80%. If you really need to keep them, clean them and remove all corrosion. Put them in a cool dry place and connect an automatic voltage regulated, or smart trickle charger to float batteries. It must be a voltage regulated type charger so they do not overcharge. Good luck and don't drive.

joe_ohlandt hit the nail on the head do what he recommends and you will be fine. I guess that is a hard lesson to learn $$$$$ plus time  I hope you learned from it. Lots of luck :o