Hi there, have a good time. it means : enjoy yourself! , have a pleasant time or have fun.

have a goodtime.. cowboy...

Of course A good time! Remember the rule; if after adj. uses noun, you should put article a/an before adj. Good luck!

Put the 'a' in there! Try re-wording the sentence as a question & answer to check it. "What will you have?" "A good time!" Have a good time! ;)

Hi... "Have a good time" is correct...