A surfskate is a skateboard with a special front truck that pivots and springs, so you can pump it along and carve hard turns without pushing, much like riding a wave. Surfers use them to train their turns and timing on dry land, and plenty of people ride them simply because they are good fun.
If you can skateboard you will adapt quickly, and even total beginners get the pumping motion with a bit of practice, ideally with pads on. It is a brilliant way to keep the surfing feeling alive between trips to the coast.
The coaches on adventuro can introduce you to surfskating and the technique behind it. Helmet and pads on, and treat the pavement with a bit of respect while you find your flow.