At start, the most important is date. If you want to travel (recommended site) for a penny, try to avoid hot season, like summertime for instance (use this link). Cause in time of this months of year, the weather is finest, therefore a lot of travelers prefer to go to Japan then. If you only like to take a trip, see a lot of local attractions, you will enjoy spring or autumn. Only avoid winter, because Japan is an Isle, so it will be raining all the time.
More local, but either interesting is Croatia. If you wish to go there for a vacations during the best temperature, greatest is to book cheap flights to Zagreb. This city isn’t situated close to the sea, so this connection is much less common then to
Split and Dubrovnik (straight from the source). Because of that, you are able to get the finest deal, even during famous season. And it is not hard to get from Zagreb to seashore, you just need to rent a car or use a train. It is going directly from the airport to the famous resorts.