Normally a visitor does not participate in one activity to the exclusion of others. One main activity, such as swimming, will be supplemented by other activities and use of other facilities, such as picnicking, hiking, stopping at an overlook, and so forth. Such multiuse is usually expressed in activity days.

When they arrived whither they were bent, / He made as if he farther would have went. / But they conſtrain'd him, ſaying, Night is near; / Abide with us; and ſo he tarry'd there.

[…] Matthew […] affirms that this Day-light or Day-dawn was the End of the Sabbath.

Trager (1984) recently gave a new algorithm for the indefinite integration of algebraic functions.