If planning a visit to Boscawen Park to photograph the view of the cathedral think carefully about time of day and the state of the tide, as well as the weather! This view is most productive at high tide on a calm day when the cathedral is reflected in the river. Winds are often lighter early in the morning so just after dawn is a good time to try. If it’s windier then try a dusk/night session and use a long shutter speed because long exposures have the effect of flattening out the water and improving reflections. You will need a short telephoto lens and a tripod. I suggest experimenting with neutral density filters to blur the water.
Dusk is good for photos of towns because the blue colours associated with dusk contrast well with the warm colours of the street lights. Truro can get busy so going out of season and out of hours makes sense for photography and access.
If you want to try your hand at photographing fungi: use a tripod (preferably one which allows the camera to get down to ground level) and remote release; take photos on dull days; use small apertures, maybe f11 to f16, to achieve a good depth of field (you might need very long exposures but this shouldn’t be a problem if your tripod is stable); try using a gold reflector to shine light underneath the fungi; vary your photos between close-ups and wide-angle views of fungi in the landscape.