Wow, thanks guys for all the great information! Installing a concrete border on the sides on the paver drive with additional ribbons of concrete every 10 feet or so will certainly stabilize the pavers on the hill. The information on the product installation design (Interlocking Concrete Paver Institute (ICPI) site - icpi.org) was really helpful too. The company provides specific drawing for this type of installation. A big help!
Installing a proper base will stabilize the installation and eliminate future settling.
The information regarding "Polymeric jointing sand " was totally enlightening. I never heard of that stuff! It look like you just install it like regular sand and then lightly wet it down. I was concerned about the joints washing out on the hill. Especially, since the drive will be carrying some of the site run off. Everything grows in Florida, even between paver joints and ants just love normal paving sand. This stuff will be a great help!
I can't tell you how much I have been thinking about this issue over the past few months. It's one of those things you run into as a Builder that makes the little hairs stand up on the back of your neck. You just know it's an issue that you better pay attention to. If you don't, it's going to bite you in about 6 months. I met with the paving company, landscaper, site engineer, Building inspector and concrete subcontractor on site. Even after all that, your ideas were the best! I'm really going to enjoy this web site. Thanks again guys for all you help.

