You can also do Mendenhall on your own very easily. We rented a car from the Juneau Car Rental company. It was $60 for the day and we were able to disembark at 8 AM, pick up the car and arrived at the glacier at 8:30 AM. We practically had the place to ourselves. It was wonderful! We were back downtown in Juneau by 11 for some shopping and back on board at noon for lunch. Then we went whale watching in the afternoon (but you could probably do the gold thingie in the afternoon). Or reverse the two and do the gold thing in the morning but I'll tell you being at the glacier first thing when nobody was there was wonderful.