Well, they may spend a great deal of time in the library. Elizabeth loves to read and Darcy has an extensive collection. They could sit side by side, sharing passages from their favorite books and discussing different ideas. Also, they might travel to visit Elizabeth's family often. Darcy would gradually grow more accustomed to her rather boisterous relatives and Elizabeth would be glad to see her family. Their relationship would continue to deepen as they face the small challenges of married life together.
In some fanfictions, Elizabeth and Darcy's married life might involve a lot of horse - riding together around the Pemberley grounds. They would explore the surrounding countryside, enjoying the fresh air and the beauty of nature. Elizabeth would also take an active part in the local community around Pemberley, with Darcy's support. She might help with local charities or events for the less fortunate. And at home, they would have quiet evenings by the fireplace, just the two of them, talking about their day and their hopes for the future.
In fanfiction, their daily life might be filled with genteel outings. They could often stroll through the beautiful gardens of Pemberley. Elizabeth would bring her lively spirit to the grand estate, perhaps engaging the servants in friendly chatter more so than was typical. Darcy, on the other hand, would continue to manage his estate affairs but with a newfound joy in having Elizabeth by his side. They would also host elegant dinner parties together, where Elizabeth's charm would shine and Darcy's status would be further enhanced by her presence.