We'll that's enough of the basic stuff, time to give advanced mode a try. This time head into the Editors window and start-up the advanced editor. You'll be asked at this time to pick a location and then a time of day. We're going for a sunny day near the beach, so pick the Coastal option, during the day, and you'll have a huge expanse of ocean. You're going to add the land where you want it to go. Each block represents a type of track piece, with the choices hidden behind. Just click the first one, select land, and add some land for the race. Don't worry about the look right now, you can tidy it up and make it pretty later.

click to enlarge
Our first map will have two islands connected by a roller coaster-type track. It will be a short but sweet and challenging track that will take about 30 - 35 seconds to drive. Let's begin with the first island. If you want to raise or lower the land, use the Page Up and Page Down buttons, and then paint it on. A good way to start is to put down a large piece of land, and then decrease it later with water, once you have figured out the tracks shape. The track will fit the island better this way and look like it was made for the island. Don't worry about making mistakes, just click Undo to remove any.
Telling exactly what piece does what can be hard at first. If you're working on ground roads, go to the second set of items, first collection, and select the flat-piece second from the side. Paint this like any other road, just add the green-capped start point and build from there. You'll need to do a little trial and error with the curves to locate a section that fits properly. Just remember that it will be necessary to put road sections between more specialized blocks to get them to join together and eliminate dead-ends.
We're going to add a loop to our track, to give the course a little flourish. Just to upset gamers who are realism freaks and for fun, we're going to build it in thin air. The loop is located in the second set of items, in the fourth collection. Grab two loops, both the same section, and we'll make a loop-de-loop. Just put the first loop at the end of the track, and then right click a couple of times to spin it around and finish the course. Now, select the racing mode and take a run. We can guarantee the first run won't be smooth, but fool with it a bit, and everything will be fine.
We're also going to add a few turbo blocks to our track to spice things up a bit. You'll find them in the second folder; look for the block with the chevrons. Add a few regular yellow blocks and even a few purple superfast blocks, but take care where you place them in relation to ramps and loops. Placed behind a ramp, turbo blocks make landing a random adventure, and if placed to close to a corner they can take away your ability to drive in a corner.
After this, add a second island and maybe a tough curve, using the same procedure outlined. The way you design your track impacts the race-strategy, the speed you can attain without leaving the track, and so on. Once you finish the rest of the course, of course. After your new course is finished, click the Validate button and take a run on your new track. A new track only works in the editor until you actually Validate it.
It's time to add the finishing touches to your creation by adding houses, boats, and plants to add a little graphical candy for the eye. Find the seventh slot of the beach tile-set and you'll find environmental objects you can scatter around the map. Once you have everything the way you want it, just re-validate, and your new track is complete.