There are minimal facilities for travellers with disabilities. Cracked and potholed pavements make wheelchair use problematic, hotel lifts aren't usually planned for them and public transport certainly isn't. On the plus side, the cost of renting a car and driver-helper isn’t extortionate. Some of the best local travel agencies will be able to discuss specific needs.
Travel for All (https://plus.google.com/communities/114049628154087345562; https://www.lonelyplanet.com/thorntree/forums/travellers-with-disabilities) Lonely Planet's forum for travellers with disabilities.