If its a steel frame, coat it in a few layers of car wax.
Clean the spokes and wax them (but not the rims !!!)
Watch out for places where steel and Al meet (headset and Bottom Bracket locking rings if you have lightweigh bits).
My steel machine survives a coastal environment OK. You may be better off with an Al frame, but use what you have.
If you find you're getting sand inside the bearings, then a grease injection system is good for flushing dirt out of the hubs and BB. It works with cup and cone style bearings, you drill a hole, fit a grease nipple or cover, and possibly some silicon rubber sealing lips, and squirt.
Total bearing maintainance in 1 min.