About riding the beach
Riding a bike on the beach is truly enjoyable. Many miles of Oregon's coastline are suitable for bike riding. You don't need a fat bike, but tires at least 2" wide are recommended. The best place to ride is on sand that is not too wet and not too dry. It is a good idea to time your ride with the tides (e.g., starting the ride on an outgoing tide) and to check the wind forecast. Also, be mindful of the possibility of "sneaker waves" (a wave that can come further inland than the waves preceding it). These are more likely to happen between October and March. Salt and sand are hard on bikes, and so take care to wash and oil your bike after a ride. If you live near the coast and have storage space, I recommend owning an inexpensive dedicated beach bike. I bought a used mid-1990s mountain bike for $125, and it has served me well for several years for this purpose.