Tourist taxis are the most convenient way to travel around attractions, especially while travelling in a group. Most airports and railway stations have tourist taxi services that would take you anywhere you would want to go.
The rate should be around 15Rs per kilometre on auto rickshaw but some drivers may try to overcharge up to 100Rs for 1km.
A more adventurous option is to get a bike on hire. The highway is a pleasure to drive on, with the cool breeze and coconut palms lined along the way. Once on the highway, drive north for the plains, drive south for the hills. Avoid driving through Thiruvananthapuram city, it's congested. The old highway, also called MC road, is also good to drive on. The MC road can take you deep into the hills. Try out the throaty Enfield 350 CC bikes for a truly vintage experience, check your fuel levels before you leave.
Two wheelers do not have to pay the highway toll, simply ride through the side lane.