My partner Bri and I spent two months in Split as part of our six month trip in Europe. Although we spent most of that time working, studying or at the beach, we had a lot of fun in and around Split. Split boasts a historic castle old town, a great park for walks and cycling, a long coastline of pebble beaches, and small but growing communities of interest (tech, startup, expat, sport and coffee). Outside of Split the best way to enjoy Croatia is on a boat, either the common ferries to islands or Dubrovnik, or small boats for day trips to famous spots, or whole week cruises.
One of my top recommendations for anyone visiting Japan is to visit Koyasan. Koyasan is high in the mountains of the Wakayama prefecture. It is a historically relevant village, considered the centre of Shingon Buddism in Japan. It is here that you can experience a temple stay (Shukubo), many of which include vegetarian haite cuisine and onsen. Guests are welcome to attend early morning meditations. The town and its surrounds are perfect for walks, with the long graveyards nested in forests, large gates, and pilgrimage trails with great views.