Answer:
You can use these sentences for your postcards:
I visited the Louvre in Paris where I had the opportunity to look into Mona Lisa's eyes. I went to the top of the Tour Eiffel where I could see the whole of Paris. I ate at a little restaurant called 'Mangez et cassez-vous !" where you can eat some delicious burgers for less than 3 euros, but we had to leave as soon as we finished our meal, as the name of the restaurant suggested it! I visited the 'Jamel Comedy Club' where most French comics begin their career. French comedy is very underrated!
Hope this is enough.