I bet that the resident Vistana Resort expert, bankr63, would be able to answer your question very easily . He is an owner there and is our go-to guy for all our Vistana inquiries.
Or I can post it here, but for those who want to SEE the map, follow Gina's link. The Vistana map has each building number in Red, Blue or Green. That indicates if the building is Friday (red), Saturday (blue) or Sunday (green) checkin for week stays. If you are doing a shorter stay with a start on one of the other four days, it's hard to say where you will be allocated, although I expect they would then align your departure date with those 3 days as well - easier for housekeeping changeovers.
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