A trip planner is provided for creating, modifying, categorizing, and sharing online trip plans. A trip plan includes a list of items such as hotels, restaurants, and tourist attractions selected from a travel guide or provided by a user. An item can have a street address for positioning the item on a map, an image and description of the item, and other metadata assigned by the user, such as tags and notes. The trip planner can generate an itinerary listing the items, and a corresponding map showing the locations of the items. A trip plan can be shared with other users, who can locate the trip plan by searching for the tags or other metadata.