We will be on the June 7 Canadian Rockies/Glacier NP trip. Thinking of White Water Rafting on the off day in Jasper. Tauck mentions the option in the itinerary. Does anyone who has done this trip know if Tauck will help you book it while you are there or should plan this on my own? I hate to book too far in advance since i will not know what the weather will be like. Thanks.