There are not really any attractions within the township of Udon Thani.
The attractions are all outside the town.
The only "tourists" I see are crusty middle class backpackers on the way to Laos, and sponsors who are up here in the second stage of GFE long game scam. Taken to meet the family, her brother (husband) and all the freeloaders drinking beer at your expense, and taking the piss.
The Lotus Lake is good near Kumpawapi, but I fear that greed and overuse of the delicate eco system there will kill it.