The correct answer to this open question is the following.
The difference in recreational and tourism opportunities between the coastal plains and the piedmont regions the following.
When you visit the coastal plains, you can do many touristic activities such as enjoying the beach, participate in aquatic activities such as kayaking, relax and take the sun, or visiting the many classical towns along the coast. There are also good restaurants and historic sites in some of these towns.
On the other hand, when you visit the piedmont region you first have to be willing to enjoy an adventure throughout the beautiful places offered by mother nature. You can do mountain biking, jogging, enjoy long walks through the woods, ride a horse, camping, or visit historic towns.