Wfamilycruiser

It’s our first Alaska cruise and we wanted to do the helicopter tour but it appears all excursion companies with and without the ship are all full already. Has anybody else run into this issue? Do they open up frequently? We’re a couple of months out from our cruise. Any other adventurous recommendations for a family of 4? Kids are 10 and 12, so limited to the glacier hikes that have a 12 age minimum, sadly.