I was always told that missionaries weren't allowed to go swimming, or to the beach, because "satan controls the waters." Dunno how true the rule aspect is, since I've happily never been on a mission.
It is (or was, when I was a mish) in the Little White Bible of missionary rules. Not the Satan explanation - just the policy against swimming. And like many policies in the church, folklorish explanations are derived to explain the reason behind the rule. Although the whole business about Satan controlling the water comes from D&C 61 and is basically the result of Joseph Smith not being able to navigate a fuckin' boat.
I had a companion who hypothesized that the prohibition against swimming and beach-going was to keep horny missionaries from seeing lovely young ladies in swimming suits. Seems as good an explanation as any to me.
No using face cards. But I don't have any documentation of that.
Also, no ouija boards. They invite evil spirits into the home.
The prohibition against card playing is from Joseph F. Smith (via Mormon Doctrine
, 2nd ed.):
Joseph F. Smith, Gospel Doctrine, 5th ed., pp.328-332 wrote:
Card playing is an excessive pleasure; it is intoxicating and, therefore, in the nature of a vice. It is generally the companion of the cigaret and the wine glass, and the latter lead to the poolroom and the gambling hall....Few indulge frequently in card playing in whose lives it does not become a ruling passion....A deck of card in the hands of a faithful servant of God is a satire upon religion....Those who thus indulge are not fit to administer in sacred ordinances....The bishops are charged with the responsibility for the evil, and it is their duty to see that it is abolished....No man who is addicted to card playing should be called to act as a ward teacher; such men cannot be consistent advocates of that which they do not themselves practice.
The card table has been the scene of too many quarrels, the birthplace of too many hatreds, the occasion of too many murders to admit one word of justification for the lying, cheating spirit which it too often engenders in the hearts of its devotees....
Card playing is a game of chance, and because it is a game of chance it has its tricks. It encourages tricks; its devotees measure their success at the table by their ability through devious and dark ways to win. It creates a spirit of cunning and devises hidden and secret means, and cheating at cards is almost synonymous with playing at cards.
And here's one against Ouija boards, from a manual published by the church:
The Life and Teachings of Jesus and His Apostles, 2nd ed., revised, pp.265-266 wrote:
Divination is defined as the act of determining the future by such means as cards, horoscopes, dreams, charms, Ouija boards, seances, crystal balls, and so forth. Soothsaying, or the practice of divination, is an ancient art among the ancients (Isaiah 2:6; Daniel 2:27; 5:11); it was and is forbidden to the Lord’s people (Deuteronomy 18:9–14; Joshua 13:22).