Lounge in bed together for an extra hour or two, have a coffee, and watch a show or college game day. Make some breakfast. Work on little projects or hobbies (today we need to go empty a storage unit before the next billing cycle), maybe go swimming, run some errands, maybe haircut or nails, maybe have friends over in the evening or have a date night.
ETA- forgot to mention my favorite weekend activity-the rerack! Wake up early, browse my phone or read for a bit until you start to feel the sleepies, and then go completely back to sleep for an hour. I don’t know why, but it feels like the best sleep ever, and you wake up feeling so good and rested.