Personally I would say stay away from unusual attitudes for a passenger who has never been in a light aircraft before. I am all for letting the pax have a go at flying including some gentle turns and climbs/descents. Pretty much everyone I have let fly have enjoyed the experience, although most are happy with only a few minutes and then want you to take over.
I have taken a lot of people out in my Nanchang. Many profess a desire to experience some "fun" flying but in my experience less then half actually enjoyed even mild aeros. I now start with steep turns (60 deg bank) If they are happy with that then I do a mild wing over. This is usually as far as people want to go. If they are still game then a roll and a loop will be enough excitement.
One thing that is very important with pax when you are doing anything other then gentle manoevering is to make sure they know to look straight ahead. A roll with the pax looking sideways will almost always result in instant nausea
