There's people on the streets trying to get you into bars and clubs (and even more seedier places, since its Kabukicho). They're just annoying since they sometimes follow you for a while and won't take no for an answer. And you should always say no unless you want to at best get ripped off or at worst get robbed and/or drugged. It's cheaper-ish to stay there than other places in Shinjuku though, and it's less seedy than it used to be.