Also, learning which surface plants are edible will mean we'll never starve again as long as there's vegetation around. Additional information on beneficial or poisonous or outright wierd properties can also be useful. Where else to learn herb lore than from Elves? Same goes for their woodcrafting skills, especially if it involves getting the tree to grow the way we want it- may be very useful in some situations. Learning how to befriend animals will mean animalman, giant animal and underground beast companions and mounts, and not being attacked by any wild animals, also potentially turning enemy pets against their masters is very cool. Some kind of meditation might let us control the gauntlet more, keep control when it's activated, that sort of thing. Being able to enter and exit martial trance at will is also a neat option.
As for the more theoretical parts of our lore-diving, we can fight passably well already and are picking it up just fine, but it's about time to learn more about deciding why and when to fight. The gauntlet lets us get away with a lot in the fighting department, but we really need to learn more about smooth-talking our way through tricky situations. And nowhere did it say the path of tranquility would be without a female companion and fine food, just that we won't do any of the good stuff to the point of excess. Eating what elven nobles eat in the company of a few friends, and having a pretty elf lover/friend with benefits is good enough for me, and leaves plenty of time for learning.
We might not have as much muscle and toughness or weapon expertise as on the Path of Discipline, nor will we get as much sex and booze as on the Path of Greed, but we'll get enough of the good points of both and a lot more useful knowledge. And probably some less useful, but amusing bits too.