Get tickets to see a game at Orjans Vall. If there's nothing on while you're in town, you might like to check if they give a tour of the grounds.
This Halmstad sporting facility is an interesting place to start your day of sightseeing. There's plenty to see and do close by, including Halmstad Arena, East Beach, and Halmstad Castle. Take your time at Orjans Vall before making tracks to these other fine sights.