Get out of Riga
For something unforgettable, head to Sigulda to see autumn in its full glorious colors.
The old River Gauja valley offers unparalleled sights (and not only because things are a bit different no matter where you go) with dazzling colors as the leaves have changed their color with the arrival of the fall. It's less than an hour away from the capital.
Alternatively, visit one of Riga's many parks to see what the weather does to the trees and find beauty in what is essentially decay that has come to symbolize melancholy and the unstoppable flow of time.
On the right bank of River Daugava, the obvious candidates are Ziedoņdārzs, Viesturdārzs and Mežaparks, though in all honestly it's even nicer if the burst of color is contrasted with a water body, in which case the left bank's Arkādijas parks and Māras dīķis are the places to visit.
Popular places to gaze at leaves falling in mellow monotony also include Riga's Dzegužkalns and the many tiny streets and green areas by the Rīga Stradiņš University.
Latvian literary comic
Not really a 'one for the weekend', but the Latvian Literature Center has published the hilarious Life of I. comics all in one place. It's by artist Reinis Pētersons with text by Anete Konste.
Definitely check this out -- you'll leave the wiser about how Latvians really are, not just their writers.