As opposed to buying a ticket for the stopover location, then buy another ticket for a week later to get to the final destination.
If you already got stuck with the layover, negotiate better 
they are inconveniencing you by causing you to stop somewhere between and waste your precious time waiting for their schedules. Literally why they are cheaper. The more layovers, the cheaper the ticket. If not, be sure to write complaints to let them know. The last thing we need to do is enable these companies more than they already are. Pay the tax to leave the airport and you’re good. They can piss off whether you want to leave for 1 hour or 1 week, theyvall have routine schedules. Greedy enough already.
Ice Cream in Riga (I see more Pols, and I think the Japan made ones in TW taste more creamy, that my taste not sure yours)
also try Salmon eggs, nice prices. at the big public market complex
ride a tram in Riga, get an older one before they are gone.
You can get a taste of Taiwan (Kavalan) in the Baltics at some pubs and cafe, Riga has also nice night life (menu in Vilnius a few months ago)
This, many in Baltics do not like it (too strong, spicy )
I love 20+ hours ride in business class, gives you more time to enjoy the journey.
It’s less fun at the back of the bus for those of us who are plebes. 
Guy
It’s good, if seat goes flat into a bed , but most Euro Business class seats are the same a economy/lower class seat just the seat next to is empty (exception is Finn Air AB-350’s is big seat/bed.
But Turkish airlines is not one of the “most european airlines”. All TK flights between Europe and Istanbul have proper business class seats, although not lie-flat. The longhaul fl8ghts between Istanbul and Asia are always lie-flat.
20 hours in this instance means a 20 hour layover, not flight
With TK longhaul flights in business class that require long stopover in Istanbul, you are entitled to a free 5-star hotel stay, free mini bus transportation between the airport and the hotel and free meals at the hotel during your stay.
Nice Airline, the one dislike of their huge airport is its too big (Need walk far!) and that they fly older 777’s to TPE (Business class is better in the newer 787/A350). But yes, great stopover city, nice sights and great food.