Cruise lines appreciate the loyalty of customers who sail with them again and again, and some lines offer special discounts or shipboard credits to their past guests on select sailings. Always tell your Vacations To Go cruise counselor if you are a past guest of the cruise line you are inquiring about so that he or she can compare any applicable discounts to other discounts and find the lowest possible rate. Proof of past-guest status must be provided at the time of booking.