When it comes to coffee quests, vacations and traveling pose both opportunities and challenges. On the West Coast, where I am visiting friends and relatives this month, it is a chance for me to sample selections from Peet's Coffee and Teas. In December, I enjoyed the Sumatra and Aged Sumatra. This week, upon arriving in Los Angeles, I bought what was billed as a high-end blend -- JR Reserve -- and a heavily promoted single-source bean from Costa Rica. More on that one later.