Usually for trades I like to make it short and sweet (i awkwardly get in a ?ok I?m ending now thanks bye!? really quickly before they can say anything). But if I?m in the mood and the user has a high rating, I?ll ask if they want to visit Re-tail or catch fish, etc. and I let them walk around on their own... even in my own town I feel super awkward baby sitting them. I?m very proud of my town so I like it when visitors stroll around on their own and enjoy themselves. I?ve never had a problem with people stealing things.