We are flying into San Diego and plan to drive up the coast day by day in mid February. Hope to see whales, Hearst Castle, redwood trees and roosevelt elk. Is it necessary to book a hotel nightly in February or can we find motels as needed, depending on how far we drive each day? We don't want to be locked into a firm itinerary and just go as far as we want each day. We don't need high end accomodations, just clean and safe.