I did the glacier walk and I would recommend it. But beware it can be very hard going - LOTS of steps and is very cold. The day I went we started off in torrential rain, which didn't seem to bother the guides... it made it more adventurous! It's definitely a one of a kind thing to do, probably something you'll never get the chance to do again.
I did the Heli hike and really enjoyed it. About half our group heli hiked, the others did the glacier hike. I know some of them felt they didn't get to spend very long on the glacier & found the walk pretty exhausting- they also didn't get to see any ice caves but as the glacier changes all the time they might just have been unlucky.
We got some amazing views of the glacier and spent plenty of time exploring the upper section. If you've got the cash to do it I highly recommend it!
a. you get a helicopter ride - and the views of the entire glacier are amazing.... once-in-a-lifetime b. you get much better ice to walk around and look at...
looking at pics of ppl who did the walk - they had ugly, brown ice, which didnt look good....
just a little tip, if you do the heli-hike.... be prepared to get slightly wet... our guide was adventurous, and found these unbelievable ice caves to go in and under and slip and slide in them.... if you do that, make sure you have warm, but more importantly dry clothes to wear after.
when i first got on the ice, i was cold, so put on my sweatshirt.... but then rolled around in ice - so both layers got wet.
recommend rolling around in tshirt, and then take it off (i'm a guy - so easier done), and have something dry to wear