Misc: who was sir lancelot's son?

Questions

In which river is the group of about 1,500 islands known as "Thousand Islands"?

What is the longest continuous footpath in the world?

Which herb is used to make "Pesto Sauce"?

Gina Hemphill carried the Olympic Torch at the opening ceremony of the 1984 Summer Olympic Games. Who was her famous grandfather?

Which stretch of water separates Sardinia and Corsica?