The Mountain Accord Program is a high-profile regional study that considers, among other things, the future of transportation and land use in the Central Wasatch Mountains. The recreational travel market is an important aspect of the study, including both resort and dispersed recreation destinations. In this talk we discuss the process of enhancing a travel demand model to be sensitive to recreational travel by both residents and visitors, each with significant seasonal variation in their travel patterns. We will discuss the data requirements for such an undertaking, such as recreation intercept surveys, household travel survey, parking data, and cellular phone-based origin-destination data. Furthermore, we will illustrate some of the unique model components constructed, including a visitor travel component which traces visitor travel from airports to hotels to major recreation areas. The resulting model is suitable for making planning decisions such as how best to enhance transit service to popular recreational areas and how to accommodate an increasing number of travelers to a sensitive natural mountain environment.