The following is just a pair of vignettes of impressions in Aglaonis. What the PCs actually did was wander around, occasionally follow Uridates, get drunk, and chat with Mithas and Tital.
Trading in Aglaonis
Quick note on trade: The wilds are dangerous, but usually an armed escort of 5-10 people deters 99% of all attackers. This isn't because the attackers think they will lose, but because the cost of winning will be too high. An orc warband could kill and capture 10 humans, but might lose 3-5 orcs in the process, more than 10% of their fighting strength. Most merchants trade twice a year, once in the late summer and once in the early winter, so that they can pool resources and travel in larger clumps. Uridates left considerably earlier than normal, however.
Uridates was a man of consumate greed. He knew the names of obscure, distant gods of coin, and had a lucky coin in every denomination he had ever encountered. He could identify precious metals by touch, taste, smell and sight, and could spot many forgeries merely by hefting it for weight. He also knew wine, as any Theralese merchant must, but more importantly, he knew how to sell it.
Each year, he made one extra trip up to Aglaonis. While other merchants were puttering about selecting this or that wine, and storing it for road trip amongst the huddled mass of frightened merchants, Uridates delegated that task to his assistants, gathered as wide a selection of wines as he could, and trundled up north alone save for one assistant and as many mercenaries as he could bear to part gold for.
The trick, you see, was samplers.
Wine tasting, although not so sophisticated as in Theralis, was a popular sport among the upper class of Aglaonis, a vice which Uridates was a powerful supporter for. He would sponsor competitions, and then charge entry fees to make up for it. He would visit with top wine tasters and share Theralis wine tasting lore with them. He'd not built it up, but he did everything in his power to maintain interest.
And then, in the midsummer month, he would come into Aglaonis with a wide variety of the year's wines, and sell them to those seeking some advantage in the wine tasting to come. He charged higher prices, to "make up for the danger of bringing this to you early", and as the only supplier, made a killing.
Making a killing warmed Uridates' tiny gold-plated heart.
Along the way to the city of Aglaonis itself, he sold a few bottles to this or that old friend, but he saved the bulk for the city. In Theralis, a glass of the finest wine could cost as much as 10 chalk, a bottle as much as 6-7 argur. Here, Uridates could sell a bottle of fairly good wine for a minimum of 20 argur, and have the person thank him for bringing it.
Ten mercenaries, times 20 argur each, meant he needed sell only a baker's dozen of bottles to pay their wages. That also warmed his tiny, gold-plated heart.
Beer
Athan was the first to discover it, when Mithas and Tital dragged him down to a tavern for a "blooding ceremony". In Theralis, beer was a beggar's drink, usually a weak fermentation of wheat and water that tasted only a bit better than riverwater. In Aglaonis, where fields of wheat seemed to coat everything in sight, beer had been brought to a level of art that Athan could barely imagine.
There were beers of a dark, richly brown demeanor, and a thick flavor that refused to be pinned down. There were pale beers that were subtle and cool. And it seemed that every family in Aglaonis had a special mixture all their own, passed down as secret traditions.
Wine was still superior, but beer had just gotten a whole lot better.
By the end of the three days they spent in Aglaonis, all three of the youths had sampled as many as they could, and enjoyed a rather rousing bout of drunkeness. Greppa, more forward thinking, managed to acquire two mini-kegs of his favorite flavors, and hid them away from himself for the trip home.
Foreign Libraries
When he wasn't being dragged off for beer sampling by the other two, Greppa discovered the Aglaonis phronein purgis (tower of knowledge/wisdom), a two story collection of written knowledge collected over the past several centuries. While Theralis had its own phronein purgis, the Theralis tower was less than 300 years old, and more of an imitation of this one.
The Aglaonis tower included annual almanacs dating back more than 750 years, scrolls written by the founders of the city-state, narratives of events over the course of centuries, scholarly treatises on the planes... the latter of which Greppa was sorely torn to leave when the time came.
Athletics
Although the people of Aglaonis did not pursue quarterstaffing, they were avid wrestlers and sprinters, and Athan found time during the afternoons to participate. The Aglaonese accepted him rather easily, particularly with Mithas and Tital vouching for him, and his natural athleticism fared well in the foreign city.
Merideth spent a lot of time at the athletic competitions as well, but mostly to watch.
Return
To the provincial youths, Aglaonis was exotic and strange. They sampled that strangeness, but when Uridates was ready to return, they were eager for a brief passage of familiarity as well. To Athan and Merideth's disappointment, the trip home was reasonably boring, although they spotted another armorcat (or perhaps the same one from before?) at a distance.
Then Greppa locked away his two kegs for sharing in the future, Athan and Merideth put away a few keepsakes in their rooms, and everyone slept like the dead for a day.
. It does help 
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