Attend classes and workshops together. Going through an adult education catalog and choosing what you would like to learn together is a good way to tune in to your partners interests.
Learning something new together will help you to keep the relationship alive and growing. Often, choosing something fun that neither of you know anything about, and that requires a minimum amount of time and/or money, is a good way to start.
Your weekly assignment, should you choose to accept it:
Get two copies of a local adult education catalog. (It could be a church bulletin.) Each of you independently mark classes that you are interested in attending. Compare your notes, and see if there is any overlap.