The Apex center at 72nd and Alkire in Arvada 80004. New rec center. Indoor pool with big slides, kid pool, lap pool, 2 hot tubs. A climbing wall, ice rink, all that stuff. Its not too cheap, About $8 for adults, $5 for kids. Food there is regular price. I d have better suggestions, but its to cold to go outside!
Apex also has ice rinks as does Westminster at the theater/rec/shopping complex at 104th and Boulder-Denver Turnpike (hw 36) Arvada has turned the Old Town into quaint shops and a coffee house/restaurant or two.The Arvada Playhouse always has something going on. Other than that you are kinda out of luck for nightlife. Someone correct me if I m wrong.
Watch the snow melt