With my history hat on, a longed for journey around the WW1 battlefields/cemeteries near Ypres. Flying into Brussels, hiring a car and then to Ghent, Bruges and on to Ypres for a few days, then across to Waterloo and back. That's in August OMG, but the only time my history mad friend is free, so I'm going!
Tarragona in September, day trip to Barcelona (been before), and over to Zaragoza and if I can fit it in, Lleida too.
December/January a month in Southern Spain over Christmas. Retired now so have the time.
All of the above is dependent on what way the world turns, but making plans is half the fun.