Translation of solely in German

So she and I went to the food store to buy some lunch. However, the store had almost no food and one could pay in local currency or in US dollars. One could really see the country's poor economy.
They wanted to know everything about relationships in Switzerland. One of the asked me of how guys propose friendships to girls. I did not know what she meant and explained that we were very informal.
We had lunch, checked out a few stores, the market and the beach and returned. The following morning we got up very early, checked out and headed towards the ferry port. Our ferry left at ten.