I would change the order of RF's tasks. Start by selecting a XC route from one airport to another. Then fully plan the route including weather and NOTAMs. Now start asking questions beginning with legal requirements for the flight (currencies, documents, weather, fuel, etc), and move on to taxi routes and procedures, airport markings and signage, radio communications, etc. Once "in the air," go through every mark and symbol on the chart you will pass, discussing what it is, what it means, and how to deal with it. Take that discussion all the way to shutdown at the destination. Do some "what-if's" about alternatives if your flight cannot be completed as planned due to weather, mechanical issues, or other unpredicted events. Have the FAR/AIM and AFM/POH handy to look up every answer you aren't absolutely certain is correct (and maybe even those of which you are certain).
That's a situationally-based scenario which is most similar to what the ground portion of your pal's PP ride should be like, and should provide you a full review of all the relevant Part 61 and Part 91 regs and AIM procedures for your flight review.
