Originally Posted by backofbeyond

Well, as it's a Honda - just walk away and leave it.

In reality, three months isn't too long and mine get left for longer than that over the winter without doing much at all. Draining the carb might make a difference - it depends on the bike. My XR600 would really needs the carb draining before it would restart but you could do that after the three months were up. Some of my other bikes don't need it. I frequently leave bikes for three months without disconnecting the battery and don't have any problem but undoing one of the cables probably won't hurt.

Unless you've got water in the tank I wouldn't bother with draining it. Just leave enough in there (a gallon(ish)) so that it doesn't evaporate and clog up the tap. Unless there's something wrong it won't rust the interior in that time. Just try not to buy fuel with ethanol in it for your last fill up. I'd be more worried about spraying the interior of the tank with anti rust (ACF50 for example) than I would be about doing nothing. All that anti rust has to go somewhere. Consider spraying the exterior of the bike if your storage conditions are likely to cause condensation - a sub zero night followed by a warm, wet day for example. Covering the bike helps with that.

Re oil - I've never oiled the bore and never had a problem and only changed the oil if it was due a change anyway. Similarly, flatspotting the tyres - don't bother with putting the bike on blocks, three months won't do anything.