Red Rock Canyon National Conservation Area seen from Trails Village Center in Summerlin, Nevada, U.S.A. Summerlin is a new master-planned community partially in the city of Las Vegas and partially in unincorporated Clark County (as of 2013). Trails Village Center is within the city of Las Vegas. This is a westward view from near the southeast corner of the shopping plaza, in front of Starbucks and Einstein Bros Bagels.