Disclosed herein is an “activity assistant” and an “activity assistant user interface” that provides users with dynamically-selected “activities” that are intelligently tailored to the user's world. For example, a graphical UI includes selectable context elements, each of which corresponds to a user-attribute whose value provides a signal to the activity assistant. In response to selecting a parameter associated with at least one of the selectable context elements, a first signal is generated and provided to the activity assistant. In response to providing the signal, one or more activities are populated and ordered based, at least in part, on the signal, and subsequently displayed. The parameters may include a current mood of a user, a current location of the user, associations with other users, and a time during which the user desires to carry out the activity in some examples.