Females always greet acquitances, male or female, with a light kiss on each other's right cheek. Males greeting male acquaintances shake right hands. Males greeting female acquaintances exchange the light kiss on the cheek. Close male friends will also give each other a hug.

The verbal greeting always exchanged is "Good morning/ afternoon/ evening." For greeting purposes, the morning lasts 'til 12 noon when you'd say "Buenas dias." The afternoon lasts until about 6 pm, when you'd say "Buenas tardes." In the evening you'll say "Buenas noches."

In business or when you go into a store, a simple handshake or verbal greeting is the norm between all. And don't be surprised if you see someone enter a store or a room and say a greeting to no one in particular.
When saying goodbye, Arnold Schwarzenegger's famous "Hasta la vista, baby" is NOT used! Most typically said is "Chou" (pronounced "chow") is most common, followed by a kiss or handshake as appropriate. Also used is "Hasta luego" which is roughly translated to "See you later!" If you've just finished getting service, such as in a restaurant or store, a simple "Gracias" (Thanks) is best.

There are some proprieties surrounding meals that are important. First, wait to ask to be seated if you are a guest at a home. Next, before beginning the meal, someone usually says "Buen provecho" (very roughly "good eating," but a better translation is the French "Bon appetit"), which is returned by several people. No slurping hot soup or a hot beverage—very rude! Other rude behavior is stretching, and blowing your nose at the table.
After you've cleaned your plate you'll be asked if you want more, often more than once. Accept if you want, of course, but to refuse a smiling "No, gracias" is fine. When you're finished and leaving the table, a big "Gracias" is properly directed to the hosts.

Dressing neatly and conservatively is the norm for Ecuadorians, including the poor. Especially in the highlands, long pants and collared shirts for men and skirts/dresses/long pants and neat blouses for women are the norm. Only badly dressed travelers and athletes wear shorts on the streets, though this is relaxed a bit on the coast.
There are few public toilets, except places like bus stations. You can use a baño in a restaurant, if you ask permission. Toilet paper isn't always available, so carry some with you. Sometimes some is available for a small fee at attended bathrooms. Used toilet paper generally goes in a wastebasket beside the toilet; that's better than an overflowing toilet. And don't forget to wash your hands!