Ive booked our cruise to Alaska w obstructed balcony, to be assigned, on Carnival Spirit. For $340 more we can get an unobstructed balcony, assigned room. However, we do want to do a couple of excursions, we're a middle aged, very active couple. But we do want to enjoy the views from our room too. Do room service during the Glacier. Is it worth it to upgrade at that price?