Johor Bahru is the state capital of the state of Johor and the second largest metropolitan area in Malaysia. Most tourists don't stop here and just pass through the city on their way to or out of Singapore. JB is a major local transportation hub however. Since it is just across the causeway from Singapore, some travellers use it as a hub to visit Singapore from here (lower accommodation prices) or to board the train, bus or airplane.
Ipoh is the apital of the state of Perak and the fourth largest city of peninsular Malaysia with a population of 760,000 (Metro area: 1.4 Mil). It is scenically located amoung karst limestone hills in the Kinta Valley, about 2 1/2 hours north of Kuala Lumpur. The city is somehow forgotten by most travellers in Malaysia, however it has a lot to offer with many colonial buildings and shophouses (it used to be a very rich city around the turn of the 19th century due to tin mining) and the nature (hills, caves) around. Among Malaysians it is known for good food like the popular Ipoh Chicken Rice.