Endpoint: /activities[/<options>]/list.json

        Returns a list of Activity objects.
        The options parameter can be used to narrow down the activities.
        Eg: options={"type": "photo-upload"}

def list(self, options=None, **kwds):
        """
        Endpoint: /activities[/<options>]/list.json

        Returns a list of Activity objects.
        The options parameter can be used to narrow down the activities.
        Eg: options={"type": "photo-upload"}
        """
        option_string = self._build_option_string(options)
        activities = self._client.get("/activities%s/list.json" % option_string,
                                      **kwds)["result"]
        activities = self._result_to_list(activities)
        return [Activity(self._client, activity) for activity in activities]