If possible, plan what you're carrying well. I would say bring both the consumer pns and the dslr.
When on long walks where dslr is kept in your bag, dish out the small consumer and snap away. When at slightly slower pace or a rest point where you wanna experiment with your wide angles or other glasses, dish out your camear.
I doubt your dslr will stay on your neck all the while. Its gonna be heavy and cumbersome.
If weight is an issue, just lug around the dslr and forget the consumer. As mentioned earlier, you most probably gonna do this once in a lifetime and never again. You wouldnt want to reach the top and realised, ah..why didnt I bring my dslr along?