As far as the AP it really is up to you there are so many to pick from. For commercial applications I like to use Cisco, typically they work better and have less down time. But for something small like you are doing you can use Home Office AP's and they should work well. -WS
I have used the following for small offices and they work well, however I don't know if they will cover the 2500 feet you talked about in the above posts. You could buy one for each cabin and that would work since you are going to have a wired connection as well.
Amazon.com: Cisco-Linksys Dual-Band Wireless-N Gaming and Video Adapter: Electronics
Others:
Amazon.com: Cisco-Linksys E2100L Advanced Wireless-N Router: Electronics
Amazon.com: Cisco-Linksys E2000 Advanced Wireless-N Router: Electronics
This has great reviews, but again I do not know if it will cover 2500 feet.
Amazon.com: Cisco-Linksys E3000 High-Performance Wireless-N Router: Electronics
WindowsStar
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