By air:

By car:

From Bangkok take Route 4 passing Petchburi, Prajuab-Kirikan, Chumporn, Ranong, and Phang-nga Provinces before reaching Krabi; a total distance of 946 kilometers. An alternate route is to take Route 4 to Chumpom and then tum onto Route 4L. This leads through Lang Suan District of Chumpom to Chaiya and Wieng San Districts of Surat Thani; from there follow Route 4035 passing Ao Lur District of Krabi, back onto Route 4, and down to Krabi Town. This shortcut is just 814 kilometers, and is followed by the bus services from Bangkok. For information regarding bus transport, contact tel. (02)435 1195-6 (non-air conditioned buses);or tel. (02)435 1200(air conditioned buses).
From Phuket Take Route 402 to Route 4 and pass Tambon Koto Kloy of Takua Tung District in Phang-nga; Tap Puhd District, Phang-nga; and enter Ao Lur District of Krabi; the total distance is 185 kilometers. Regarding bus transport, tel.(076) 211 480.

By train:

From Bangkok Station take the train to one of the following stations: Trang, Putt Pin in Surathani Province, or Tung Song in Nakorn Sri Thammarat Province; from any of these places a bus may be taken onward to Krabi. Regarding train schedules and costs, contact the travel office of State Railway of Thailand, tel.(02)223 7010

By boat: 

There are ferry services from Phuket (via Phi Phi) or you can hire longtail boat everyday.
To get around Ko Lanta you'll have to rent a motorbike and this can be done at most resort counters. 
Make sure that you are familiar with the vehicle, test the brakes, the lights and horn and remember to drive carefully when you pass through or by villages and schools. 
The Island has a population of approx. 20,000 people. The Community is a mixture of local muslims & northern Buddhist. 
The northern Thai's have come to the Island to work in the tourism industry. Most of the muslim community earn their living from fishing, prawn farming and rubber plantations whereas the local trade, especially in Saladan is predominantly under the control of Thai's from Chinese descent. 

How to get to Koh Lanta
By boat	Departure		Arrival
Phi Phi Island Koh Lanta	11.30 AM.		13.00 PM.
	14.00 PM.		15.30 PM.
Koh Lanta Phi Phi Island	08.00 AM.		09.30 AM.
	13.00 PM.		14.30 PM.
Krabi Koh Lanta	10.30 AM.		12.30 PM
	13.30 PM.		15.30 PM
Koh Lanta Krabi	08.00 AM.		10.00 AM.
	13.00 PM.		15.00 PM.
Phuket Phi Phi island	08.00 AM.		09.30 AM
Phi Phi Island Phuket	13.30 PM.		15.00 PM
By Mini Van + Ferry	Krabi - Koh Lanta		Koh Lanta -  Krabi
Thai Air Lines Daily flight from Bangkok to Krabi Flight Schedule click here	Departure	Arrival	Departure	Arrival
	10.30 AM.	12.30 PM.	07.30 AM.	09.30 AM.
	13.30 PM.	15.30 PM.	08.00 AM.	10.00 AM.
	16.00 PM.	18.00 PM	13.00 PM.	15.00 PM.

Remark:

Until recently limited access has been the major restraining factor in the growth of Krabi's tourism industry. The nearest airport was 155km to the east in Phuket and the drive on what is a rather basic road took a good two hours. But all of that has changed with the opening of Krabi Airport (see issue7). Now the problem is no longer access rather accommodation. Currently Karbi has a total of 5,000 hotel bedrooms of which 3,000 are in the three to five star category. Several resorts are working flat out to be complete and open for the start of the high season in November as 1,000 bedrooms extra bedrooms are already fully booked and paid for by major Travel Agents allocation.