If you look up under teh dash all teh way to the left of the car, you should see a baremetal area where there carpet and crap has be removed. You can drill a hole there to run the power cable to teh battery, then run teh cable along teh side of teh car to the trunk.
look on the passenger side of the engine bay and on the firewall there is a black rubber gromet. Use a flexible dowl rod or some small metal rod and run it through the hole...it comes in behind the heater fan inside the car.
Like other's have mentioned, you can find unused holes that Honda left in the firewalls. This is definitely best. If you need to drill a new hole, make sure that you use a rubber grommett to protect the wire from chaffing and shorting out.
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