Chapter 15 Recreation Demand Models Travel cost recreation demand models stem from a simple but penetrating insight. Consumption of an outdoor recreation sites services requires the user to incur the costs of a trip to that site. Travel costs serve as implicit prices. These costs reflect both peoples distances from recreation sites visited and their specific opportunity costs of time. Today economic analyses of recreation choices are among the most advanced examples of microeconometric modeling of consumer behavior in economics. The primary focus of this chapter is on the methods used to describe individuals recreation choices. We are interested in the economic assumptions made in descriptions of behavior and measures of the economic value of amenities. Before developing this summary in Section 2 we discuss how outdoor recreation fits within consumers overall expenditures. Section 3 describes how we might ideally like to estimate consumers preferences for recreation resources and the compromises implied by the models currently being used. Econometric details are deferred until Section 5 after a discussion of the features of recreation data in Section 4. In Section 6 we turn to conceptual issues in welfare measurement. We close in Section 7 with a discussion of a few research opportunities that seem especially important for the future.