The sightseeing spots of Karatsu include Karatsu Castle, towering above the seaside, and the Former Takatori Estate, which was the house of Takatori Koreyoshi who made his fortune with coal mines. This is also an important fishing spot and the squid of Yobuko is a specialty of the area. You can enjoy fresh seafood at Yobuko Morning Market, which is held from 7:30 in the morning until 12 o'clock every day except New Year's Day.
Every November, at a festival called Karatsu Kunchi, huge floats called Hikiyama are pulled through the city and many people come from all over the country to see it. If you are interested, you can see the floats exhibited at the Hikiyama Floats Exhibition Hall at times other than the festival season.
Besides that, it is also a production area for ceramics often used in tea ceremony, the famous Karatsu-yaki. These pieces can be purchased at pottery studios including Ryuta-gama Kiln.
It is convenient to have a car for getting around this area but some spots are within walking distance of Karatsu Station. From major cities, it is accessible by train, bus and taxi. The nearest airport is Fukuoka Airport and the train from the airport to Karatsu Station takes about 1 hour and 30 minutes. It takes about 3 hours from Tokyo.