KC: sorry I missed this earlier (I live in Kenai). John has nailed it:
Johnson pass for a shorter trip. Resurrection trail for a longer trip. I usually do the Hope to Cooper Landing portion (40 miles) because it is better maintained. Cooper Landing to Seward (Exit Glacier actually) 35 miles was full of blow-down trees and had a bridge out when I last did it. Maybe call the USFS in Seward for an update. There are USFS cabins spaced along that route, usually booked long in advance, but may be worth checking on.
Shorter but more scenic (and rigorous) per mile would be Twin Lakes north of Seward - 7 miles one way from either trail head for a 28-mile death march, I've done it all out and back in a day - has nice views of Ressurection Bay on the south end and a lovely alpine, above tree line, above brush line setting at the lakes.
More vertical and with no water in the middle is the Skyline traverse ( of the ridge line) between Skyline Trail (mile post 58? On the Sterling Highway) and out on the Fuller Lakes Trail). 8 or 10 miles? But 5,500 vertical feet. Lots of crowberries to nibble and I usually encounter Dall sheep along the way. The descent to Fuller Lakes is hard to do without bush whacking thru alders so have some leg and arm covering of some sort. I like thin nylon pants (Patagonia, gramicci, etc).
PM if you need help with a pick up or drop off.