If mobility is a problem, visiting Crete will present serious challenges. Most hotels, ferries, museums and sites are not wheelchair accessible, and narrow streets, steep curbs and parked cars make getting around difficult. Newly built hotels are required to be more accessible to people with disabilities by having lifts and rooms with extra-wide doors and spacious bathrooms. People who have visual or hearing impairments are rarely catered to. Assume nothing.
Of the bigger cities, Rethymno has the best accessibility rating. Many of its beaches are wheelchair accessible, as is much of the old quarter, the Venetian Harbour and the waterfront promenade.
For full trip planning, consider Eria Travel (www.eria-travel.gr), a travel agency for people with disabilities. Staff can help you find accommodation, adapted transportation and medical support, as well as arranging excursions and activities. The company also operates the Eria Resort in Maleme in western Crete that is one of the few in Greece customised to disabled travellers' needs.
For additional help, download Lonely Planet's free Accessible Travel guides from http://lptravel.to/AccessibleTravel.