Verb conjugation of "stroll" in English

I want to improve my level of English. Have you ever been in the U.S. and in which states have you been? I've been in England, Scotland and Ireland, but unfortunately, I have never been to America.
You have to be careful when you go on summer vacation. There are many dangers but the most dangerous one is the sun itself, because if you're not careful it may harm you. People underestimate the rays.
I would also like to stay for some time abroad, I had no time yet. With all the kids it is difficult. Next year, however, we might go to Rimini for a month. We will rent a house there in the summer.