It is very nice to e.g stroll along the canals in Amsterdam. Many nice quaint hotels is this district too. But for more serious walking refer to these books:

Selected walks: For walks see Frommer’s 24 Great Walks in Amsterdam and Walk & Eat Amsterdam by Cecily Layzell (pictures above). I have not used any of these myself though so I cannot claim to know much about them.
• Good starting points: • Just about anywhere in the central canal district will do for nice strolls, otherwise refer to the books

• How to get there: • By air

• More info: Sorry, none yet