Here are a few examples to get you started....
Sight...visit an art gallery, look at the "family album", walk in a garden noticing the different colours, go for a walk, sit outside on a patio and people watch, watch the sun rise/set, draw, paint your nails, get a haircut or shave
Sound...go see a live band, listen to your favourite music, call a loved one just to hear their voice, go outside, closing your eyes and just listen to the sounds of nature around you, visit a beach and listen as the waves crash the shore