The Narnia series is wonderful!!!! I loved those books. Another series I loved, especially as a kid, was the Black Stallion series. I still read those.
I've just discovered E.M. Forster. Finished reading Room with a View and am now in the middle of Passage to India. What an insightful, subtle writer.
For you armchair summer travelers, I recommend Jules Verne's Around the World in 80 Days.