If you drink alcoholic beverages, invest in a bottle or two of good wine. If you do not drink alcohol, invest in a few bottles of non-alcoholic sparkling cider to create a festive mood. Plan several simple, but pleasing meals. Share in the preparation of these meals. The kitchen can be an erogenous zone.
Food can be very sensual.
Bathe each other. Never mind trying to shower together, you'll wind up fighting for the prime spot underneath the spray. Take your time. Lovingly caress your partner, as he or she allows you to bathe them. Get dressed up as if you were going out, but don't.