Udon has 2 modern and smart 10-pin bowling alleys. The first is located at Big C Shopping centre (Map X18) called UFO and the second is located on the top floor of the Charoensri shopping centre called Majorplex bowling (Map O11)
Other things to do:
Walk around Nong Prajak Park in the evening, have a massage and something to eat.
Have a few beers at the nightmarket while the gf does some shopping.
Catch a movie at the Majorplex cinema.
Have a game of badminton Map Ref J15
Do 60+ laps of the Prince Prajak monument for good luck and to supposedly make your wishes come true (don