I've got to the summit multiple times. The farm maps I've done it for are: Meadowlands, Hilltop, Beach, Riverland, and Forest. Currently working on Wilderness.
If you reach Perfection, the boulder blocking the road to the summit will vanish, but you need to find the perfection tracker and interact with that first. Max out all skills, beat all the monster hunter goals, cook all dishes, craft all items, and that's just a few of the criteria. Eventually you'll find a perfection tracker that you can check to see how you're doing.