The town of Hallstatt on the shores of Lake Hallstatt is a very interesting place, with ancient salt mines (in which summer music concerts are held) reachable by foot or by funicular. You can reach the lake by train, then take a boat into the town of Hallstatt. It's a fun trip for kids, and if the weather is bad, you just hop the excursion boat when it's running. It'll take you around the lake, which is ringed by mountains. Idyllic.
The link takes you to a virtual tour of Hallstatt and the lake, to find out more, see: Hallstatt, Austria Travel Information.
Ok, you've heard of the big Italian lakes like Lake Como, or Lago Maggiore, or Lake Garda. But what's this Lake Massaciuccoli? Well, besides having a name that's fun to pronounce, this is the lake to come for the Puccini Festival in Summer. The rest of the time there's a fine "oasis" called Oasi di Massaciuccoli, a wetland park on the other side of the lake popular with photographers and bird watchers.
The link takes you to a virtual tour of Lake Massaciuccoli and Terre del Lago Puccini, to find out more, see: Torre del Lago Puccini Travel Guide.
Finland is called "The Land of the 1,000 lakes", but in fact the country has more than 188,000 lakes with 98,000 islands, according to 10 Fun Facts About Scandinavia. For my money, I'd head over to Finland's huge Taiga Forest, home to endangered species like the brown bear and the wolverine, as well as wild forest reindeer and moose. Have a ball with your Travel DSLR in April when the bears awaken. Lots of lakes and bogs in the Taiga Forest.
We think of lakes as the dominion of forests and wide open spaces. But lakes also form part of the urban fabric, and Berliners enjoy several lakes in and around Germany's capital.