The castle and garden are generally open Mon - Fri from 10:30 am to 5 pm. The castle is also usually open on Sun, but the garden is closed during the whole weekend.
(Last admission 45 minutes before closing.)
The opening hours may however vary according to the season - be sure to check the official website prior to your visit.
Ferry ride cost: £2.00 (one way adults)/ £1.00 (one way children).
Official Website https://www.stmichaelsmount.co.uk/
National Trust website http://www.nationaltrust.org.uk/st-michaels-mount/
Phone +44 1736 710507
Address Tidal Causeway (Check Tide Times)
Coordinates 50°6'59.66" N -5°28'41.463" E