Just an idea.....
I have had the opportunity to fly the length and breadth of the UK and some other parts of the world and one of the greatest and most beautiful flights is one along a coast line, low level. If you have enough cash for a circumnavigation of the UK you will see sights you never dreamt of. I suppose you could almost achieve the same in a C150 but it will need a lot of time overnighting at boring airfields whereas you are likely to find enough helipad equipped hotels to satisfy your needs.
No navigation problems are likely - keep the blue stuff on the left and the green stuff on the right and keep going until you arrive where you started.
Similar flights along the coastlines of the world will also intrigue and surprise you.
G
PS. when you are bored with coastal flying you can try flying around the mountains but for that you will need a professional guide or some good training. Mountains can be awe enspiring.