It is best to travel with someone, rather than alone. Check with the local Automobile Assosicatio or the Police if there are any problems etc on the next stage of your trip, especially if it is not a major road. Also ensure that you are driving within your capabilities. It is a sad fact that high proportion of accidents in the NT involve tourists. By the way, the NT has some of the best roads in Australia.
Contact numbers are available at phone boxes and in the phone directory.
Here is the email address of one hire car owner, if there are any queries, etc. There are many agencies who can provide information on travel to or from Alice Springs and surrounding areas. This is suprisingly a common way of seeing parts of Australia. Also take care that the winter temperatures can drop to below freezing. Sea - Water As mentioned above, a boat is not able to get to Alice, unless it comes via road on a trailer.