In one implementation, a computer-implemented method includes receiving, at a computer system, a request for outdoor adventures that satisfy one or more criteria; accessing a centralized data repository of outdoor adventures that are provided by a plurality of different guides; identifying, by the computer system, one or more outdoor adventures based on a comparison of the one or more criteria to data associated with the outdoor adventures; generating code that includes information for the one or more outdoor adventures, the code being generated for execution or interpretation on the client computing device; and transmitting the code to the client computing device, wherein the client computing device is programmed to automatically execute or interpret the code upon receipt so as to present a graphical user interface presenting the one or more outdoor adventures and a selectable feature to reserve at least a portion of the one or more adventures.