Dalat, also Da Lat, located in the South Central Highlands of Vietnam, was originally the playground of the French who built villas in the clear mountain air to escape the heat and humidity of the coast and of Saigon, now know as Ho Chi Minh City. Dalat's high altitude (1500-2000 m) and fertile landscape make it one of Vietnam's premier agricultural areas. In fact, in markets as far north as Hanoi, vegetable and flower vendors will tout their "made in Dalat" produce.
Most guidebooks describe Dalat as a cheesy town popular only as a local honeymoon destination with tacky sites. The good news about that description is that the town is not over-run with tourists like some other cities in Vietnam. The bad news is that the description is not entirely untrue. There are tacky sites in Dalat where local honeymooners go to get their pictures taken by photographers, but Dalat is surrounded by some of the best mountain biking, hiking and canyoning opportunities in Vietnam.
Most local and foreign travellers arrive in Dalat by bus, particularly on the famous Sinh Cafe Hanoi-HCMC bus route. From Nha Trang, the bus ride is about 5 hours, with the obligatory stop at a dilapidated Chaam temple/tourist site. From Ho Chi Minh City, the bus ride is also about 5 hours.
Depending on where you stay, you can walk to most parts around town. You can catch a Xe Om (motorbike taxi) from most corners, so if you're going somewhere farther out of town, you have a fast way to get there.
You can also rent a motorbike by the day.