Christmas Markets are a very popular early winter river cruise destinations in the EU, and I have done that. We visited Easter markets on an early spring river cruise... We have been to about six Christmas Markets and three Easter Markets. Easter Markets win hands down because:
1] Better weather. The warmer temperatures really pay off if you want to sample Market food. We spent three days in Prague eating Prague Ham cooked over an open wood fire at the Old Town Square Easter Market for dinner. The "warm" spring weather was just barely tolerable for dinning out doors. Not so at Christmas markets, which may account for the popularity of hot wine drinks...
2] Christmas Markets sell nutcrackers and other Christmas decorations, most of which you already have. Easter Markets have other stuff. The most important are the decorated East European Easter Eggs, true works of art. Although the decorated egg sellers assured us they could pack eggs so they would survive the reaming 10 days of our EU trip and the 17 hour flight home and the 50 miles drive home from the airport, we didn't take a chance on it.
3] While it seems all markets are crowded, Christmas Markets are far more crowded.
Enjoy the charming medieval streets of Piran Wander the underground tunnels and passages at the Skocjan Caves, UNESCO Karst natural site Do not leave without trying a slice of the local air-dried prosciutto and a glass of the local wine Teran Photo-stop at the Guinnes World record Holder - Predjama Castle, largest cave castle in the world