How to say "Say hi to someone" as a description? So, I've been trying to figure out what is the best way to describe the sentence "I went to the store to say hi to the owner". (Imagine in this context I haven't seen him for a certain amount of time, so I'd like to go in and just quickly say "hi" and then leave)
Do people say  “跟他说你好？” 
比如 “我最后决定去跟那个老板说你好。”
“Say hi to someone” in Chinese is just a simple 打招呼 (unless you mean "please say hi to so-and-so for me - then it's 问好).

so what you want to say here is: 我跟老板打了个招呼....