I live in Lund, about an hour's drive from Copenhagen, 10 km or so north of Malmö. You'll be going past us on the E22 as you drive to Kalmar.
Lund-Kalmar takes two and a half hours if you sit precisely at 10km over the speed limit and there are no other cars. In normal driving conditions it's about three hours. Plenty of opportunities and time for a break, but only half a day from Copenhagen if you want to just get there without fuss.
What sort of photography are you interested in doing? Perhaps more importantly, is the main aim of your trip photography or tourism? There are plenty of photogenic tourist destinations where you can snap away while absorbing the local culture, but also places like the local beech woods which are like beech woods anywhere, but are very photographically rewarding if you like that sort of thing (and could well be carpeted with wildflowers in mid-April).
Kalmar is a lovely town, with a fairy-tale castle and an old town center. Öland is one of Sweden's most popular holiday destinations in the summer, and has a photogenic mix of old churches, sandy beaches, windmills, bronze-age forts, limestone pavements and a wierd, twisted oak forest. By contrast, it also has a zoo and funpark where some of Sweden's most famous social observation photography was done. Quite a range.
Between here and there are a bunch of cute small towns, ancient monuments, runestones, wildwoods, fishing harbours, artists colonies and a complete C17th naval base. Not much social deprivation or Grand Nature, but lots of the sort of stuff that rewards contemplation. If you can give some idea of the sorts of things that most interest you, photographically or as a tourist, I'm sure I and the real Swedes here can help you winnow the guidebooks.
I'd love to share a 'snaps', or even a whole smörgåsbord (Sunday lunch is traditional at that time of year). I will be travelling myself mid-April, but if I'm around when you pass through it would be great to meet another APUGger.
