Many people choose a guided walk to the glacier, which I can highly recommend and there are number of companies to choose from. They all offer an excellent service and you will be in good hands whoever you choose.
Another popular option is to take a heli-hike. I've done this myself and it is incredible and well worth the money. It also takes less time and so gives you more time to do other things while down there.
You can also take a scenic flight landing on the ice, without the hike.
If you have time to kill either before or after your glacier trip, there a a lot of other activities to choose from.
You can hire a quad bike and explore the region.
If kayaking is more your thing you can join a tour at www.glacierkayaks.com

If all this activity sounds a bit much or you need to revive your muscles then I can highly recommend a soak in the hot pools at www.glacierhotpools.co.nz There are 3 pools, each one a different temperature. You can also book massages and spa treatments. A great way to unwind after a walk on the ice.





