My husband and I are travelling to Patagonia in January. Because it is busy season, we have pre-booked all our accommodations and any tours. for buses between El Chalten and El Calafate, do you recommend pre-booking? We've been doing some reading and it seems like they run quite frequently and you can always just catch 'the next bus'. Pease let me know. We have pre-booked our tickets for Calafate to Punta Arenas but that's it.