There is no bus service to/from DS and the parks. You would have to go from DS, to a resort and then hop on a bus to AK from that resort. Going to AK, closest resort would be AKL. Your other option is to grab an uber/lyft from DS.
As PP said, no buses from DS to resorts you would need to go to a resort first and then to AK.You could walk over from DS to SSR and catch a bus direct to AK from there.