most are down in the valley (phoenix area) or near the boarders of arizona ie lake powell located near Page Arizona, one of the smallest and most remote towns in all of the US (on the boarder of utah and arizona). lake mead (boarder of nevada and arizona/ hoover dam) could be considered too. though most riders who go there probably live on the Nevada side, Vegas mostly. havasu is also on the western boarder along with others and is very popular for all types of lake activities.
on a personal recommendation...come to Powell. we are in need of core LOCAL riders. it is tough to find a third most days, let alone more than that. but you got to like remote small cities. there are other more important reasons to choose powell of course... as a preferred lake that is