Go first thing in the morning. That's the best time. Nobody's around and you get it out of the way. That way you don't have to think about it after work.
That's when I go..I'm a morning person and much prefer that. I notice that there's definitely a different crowd in the morning than at night. Most are on their way to work,get in and workout and then go..The few times I've gone at night (after 6PM),I find it to be a meat market/social gathering type crowd. With the occasional meat/muscle heads thrown in. Def not my thing. But to each their own..Everybody's different and you've certainly got to find what is best for your own self..