World Drive sidewalks and/or a footpath from the Contemporary to points south, please.
It's honestly stunning to me that the Grand Floridian / Magic Kingdom pathway got built before any kind of walking solution between the Wilderness Lodge and anywhere else did. It doesn't get much cheaper than sidewalks as far as transportation improvements go and it looks like there's already a (CM-only?) stub sidewalk at the World Drive underpass which represents the only technically challenging part of this hypothetical route. Drop a couple crosswalks down and associated signaling or signage and it's good to go. Total slam dunk compared to carving a new pathway wholesale out of Grand Floridian.
Besides using it to walk between CR and WL at one's own convenience without needing to deal with a boat launch, the ~15 minute walk to TTC is likely time-neutral with boarding the monorail at CR and then transferring versus simply walking to TTC and boarding the Epcot monorail directly (disregarding relative security clearance times), and the return trip is almost certainly going to be faster than riding the Resort monorail on its full circuit. And speaking of circuits, there might be some fringe value in having a complete walkable loop path around the entirety of Seven Seas Lagoon.