Brigham Young may have had another location in mind prior to the Salt Lake Valley. What was it?
A. Baptism by immersion
Baptism by immersion was perhaps the most distinctive Latter-day Saint practice to the islanders. The English missionaries [non-LDS missionaries] had baptized by sprinkling, so the Tahitians had never seen baptism by immersion. At times hundreds of people came to the shore to witness the ordinance. The elders were quick to take advantage of the islanders’ fascination by holding preaching services at which baptism by immersion was defended with scriptural passages. And while the English missionaries called the Mormons ma mai ia (fools) for baptizing by immersion, the islanders soon learned the biblical scriptures to prove to the English missionaries the validity of this practice.
Voyages of Faith-Explorations in Mormon Pacific History, Grant Underwood, (Brigham Young University Press, Provo, Utah: 2000), 22.