Gravitational waves are ripples in the fabric of spacetime caused by the acceleration of massive objects. While gravitational waves are fascinating and have been a subject of intense scientific study, they are not suitable for "riding" in the same way we can ride on water waves or surf on electromagnetic waves.
Gravitational waves are extremely faint and have an extremely small amplitude. They also propagate at the speed of light and can pass through matter without significant interaction. This makes it challenging to harness gravitational waves for practical purposes, such as space travel.
Furthermore, the energy carried by gravitational waves is relatively minuscule compared to other forms of energy, and it is spread over a large area. The amount of energy available for extraction from gravitational waves is currently beyond our technological capabilities.
While gravitational waves have revolutionized our understanding of the universe and play a crucial role in astrophysics and cosmology, they are not currently feasible for propulsion or transportation purposes. Traditional rocket propulsion methods and concepts remain the primary means of space travel at this time.