HI I LOVE THIS QUESTION

snack wise- it seems like amaro eat like guinea pigs, mostly subsisting off greens with a few vegetables and fruits mixed in. because Seto in particular was a malnourished rescue case, I can only imagine he hardly ever had access to decent feed before getting picked up by Ardbert, so getting him quality food would have been a priority right away (despite not being terribly well established adventurers at the time- i can't imagine money was flowing in rivers quite yet!). I think even from an early point Ardbert's favorite snack for Seto would be the equivalent of non-GMO organic $12 a bundle kale when he could afford it, much to the confusion of his companions LMAO- a habit that would continue into the days of fame and fortune (and infamy). even better when he could get something local- going on walks with Seto to find little farms and homes and offer to buy lettuce from their gardens so Seto could always try something new.

(good deal for the locals, too, if the warrior of light comes up and is like "hey can i buy your lettuce for my dog :)" and gives you enough money for it to buy another small house)

as far as where he'd like to go with Seto- Rak'tika! due to the restrictions on the area it would hardly be a common stop, but as Seto got stronger at flying, Rak'tika would be a sort of personal challenge and goal- to regain enough strength to some day fly above the blanketing canopy of the trees. It's a fond memory for Ardbert of the day it happened- Seto's careful ascent up twisted branches and the break through to a dizzying, endless sky, the treetops a shifting sea below. howling, unrestrained wind that spoke very clearly about how this place was not meant for them, and the distant birds flying yet higher above. the reminder in their victory that the world they lived in was bigger than they would ever be able to experience- but that with each other, they could see parts of it that alone neither of them ever would.

(outside of that- personal fondness for Voeburt in the winter because amaro are so funny covered in snow. and getting tackled by an amaro scorned by an unexpected snowball is funny if you're ardbert.)