I was in a similar situation with a camp what was over an hour away.

If you don't have the time for a food plot, or the area isn't right to support one, then load the spot up with mineral blocks. I've had great response from 'Deer Cocaine', Apple Blocks, and Sweet Acorn blocks.

I'll drop the blocks right on top of a corn pile. That helps the deer to find them, and once they know they are there, they will keep coming back.

I've seen deer come back to spots that I've put down the 'Deer Cocaine' from previous years, and lick and paw at the dirt. You will end up with a nice hole in the ground over time, and I just keep dropping the blocks in those holes.

We have also had good success out of trace mineral blocks and white salt blocks that are used for cattle. The trace mineral is probably better for rack development, but the deer seem to like the white salt blocks better for some reason. They always seem to get hit harder. These salt blocks for cattle are much more cost effective, and might be worth a look. They are big and last a long time.

Good luck.