We just came back from spring break in Japan. You can see my comments in the Starwood forum as we used those points.

We traded in our JR vouchers and left from Shinagawa station which was closer to the Westin and much smaller and easier to navigate; also one stop closer to Kyoto. Truthfully, I found the vouchers a waste, as we actually only used them to go to Kyoto and then back to Tokyo and Disneyland. The trains were such a pain with luggage and multiple connections that we just took the bus to and from the airport.

I can't imagine doing a day trip to Kyoto and actually seeing anything. The stuff you want to see is a taxi, subway or bus ride from the station. We were three nights there and still missed a lot, whereas there was not much of interest to my 17-year-old in Tokyo except Disneyland. The second park, Disneyseas, is well worth a day of your time.