Lined up along the market square, horse-drawn carriage rides are a popular, albeit for some controversial, way to tour/trot around the Old Town. Operated by a number of different companies, routes and prices are individually determined with the driver, but the most popular route from the market square to Wawel Hill takes about 30mins and is generally 200-250zł in winter, 250-300zł in summer; you can expect to pay about 500-600zł if you carry on to Kazimierz. Most carriages fit 4-5 people and the number in your party has no bearing on the price. Unfortunately the drivers don't disseminate any information about what you're seeing along the way (hey, you might need this guidebook after all); that bright idea hasn't occurred to anyone yet. Still, it's many a young girl's dream to be lifted into a horse carriage on Kraków's market square, so be prepared. And don't forget to ask the driver to take your picture; it's the least they can do for the money.
Tipping your driver is not expected, but you're welcome to if you feel it's warranted.