Example Alexa skill that uses Honolulu's The Bus API to tell you when the next bus is.
Alexa Developer Console (where the Skill lives): https://developer.amazon.com/alexa/console/ask.
AWS Console (where the lambda function backend lives: https://console.aws.amazon.com/lambda. . Depending on how you set up your alexa skill (Custom vs Blueprint), you may also need npm and to install the ask-sdk npm module. (https://aws.amazon.com/sdk-for-node-js/).
Instructions to follow. Or just follow the usual Alexa tutorials.
You will need an API key for the bus API. It can be found here:
http://hea.thebus.org/api_info.asp
More later.
Go for it.