Though the cannabis legalization movement in the U.S. has spawned plenty of "bud and breakfasts" and weed-friendly, budget hotels, a handful of boutique hoteliers are targeting the high-end cannabis traveler-- no pun intended. Expansion at the sector's more premium end comes as the number of Americans interested in cannabis-related travel has swelled, according to Brian Applegarth, founder of the Cannabis Travel Association and Cultivar Brands, a strategic marketing agency specializing in the cannabis industry. In…