We create your initial trip assuming you're using a car for sightseeing, but you can use any type of transportation. For other options between attractions, click on the Maps view on the Day by Day tab. Click on the estimated driving time between two attractions to bring up Google Maps, where you can see available transportation options.
For traveling between destinations, click the Route tab and then the travel duration/transportation mode prompt between two destinations. This will show you the different modes of transportation available, including different routes and price ranges.