Do you have a blood pressure monitor at home? If so and provided you have a few days to experiment, I'd suggest taking your pressure both before and after certain things and see how you as an individual react, since not everyone reacts alike. I've personally noticed that my BP is lowered considerably after a warm bath, though I haven't checked to see how long it stayed down. (My heart rate went up considerably, though.) I've noticed that during the periods I was eating huge salads as my lunches, especially when I was eating large amounts of lightly steamed asparagus in my salads, that my BP was running lower than normal. That could have been just circumstantial, but I've made a note to check it out for myself. Just haven't had occasion to do it since I noticed this. There has been some research indicating that eating large amounts of celery is supposed to be good for BP. I assumed that that applied to long-term BP, but you might want to check it out for short-term if you have the time to do so. Green tea is also supposed to be good for BP.
For most people, vigorous exercise initially raises BP, then lowers it for a time. If this is the case for you, you might want to check and see how long it takes to go down and how long it stays down.
Deep breathing exercises and meditation are good for BP, especially for stress-induced increases.