My family and I (are taking part in) a 10-mile stroll¹ around London today.
My Dad and I (were strolling) around London from 9 am to 3 pm.
We (had to) check three times during the stroll.
The atmosphere (was) fun. There (were) a lot of people, some people (were wearing) fancy dress.
Cadbury* people (were giving) out free chocolates.
While we (were strolling), we visited some great sights of London. At the finish I (get) a prize.
It is one of the most exciting days out I (have ever had).