Take you up on

Take you up on that offer !!!
Bryan	Thanks so much for showing me Maua. You were a great host.
J.B.	It was my pleasure.
Bryan	I hope I wasn't too much trouble, with all the stuff I bought.
J.B.	No trouble at all. It was fun for me to see Maua through a foreigner's eyes.
Bryan	You're welcome to come visit me in the States. I'll show you around.
J.B.	Really ? I might just take you up on that offer !

Explanation :

Take you up on - Accept

Example : You're offering to clean the barn? I'll take you up on that.