With room rates topping $500 a night in peak season for its signature creekside cottages, the exclusive L'Auberge de Sedona Resort attracts a wealthy, well-traveled crowd. Guests check in with ultrahigh expectations, expectations that hotel officials admit haven't been universally met as the 25-year-old resort showed its age in recent years. "Stale," "dated" and "old" are words sprinkled in reviews posted in the past year on TripAdvisor.com, a popular travel-review site. L'Auberge's new owner hopes to erase any negative impressions - and attract a new generation of fans - by plowing $25 million into a major renovation and expansion.