When I passed my PPL I did admittedly take 1 passenger up with me very soon after, something I did regret a bit. I decided I would go local with a route I knew quite well and it did surprise me how much effort I had to put in. If I had gone somewhere I hadn't been before im sure the workload would have been well over my head and probably given in and told her to be quiet
You never really realise how much is involved until you give it a go for the first time. My advice would be just do it when you are comfortable with the idea of disruption, make sure they have been told in the pax brief that you will need to concentrate a lot and may not be able to talk to them and perhaps go somewhere you have been and feel comfortable with.
Good luck, im sure they will enjoy it.