Did you know that Daugavpils has a race track 'Daugavpils Spidveja centr' on Jelgavas iela 54. So go check out some races.
Want to go skating? Daugavpils has an amazing Ice hall - Ledus Halle on Stacijas iela 45a.
But if you want to go bowling or shoot some pool, go to City Center on Viestura iela 8.
You can also walk on the Daugavpils main street Rigas iela. It is amazing.
Visit a lot of traditional saunas: (http://www.daugavpils.lv/...)