If you have conduit then trying to get cabling to connect each location and then put an AP would be the best option. If you can get conduit to the third then you may need to look into setting up a Point to Point Mesh. Get an outdoor AP setup on both cabins, point them towards each other and look into creating a mesh. With some of the AP models you can then use the RJ45 port to pull an indoor AP. Might be best to have someone come do a site survey. It doesn't take much to interfere with a wireless point to point connection. Oh yea, and one thing that bit me in the past. Keep in mind trees grow. Don't be surprised if it works now and then a tree limb grows and messes things up in the future.
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