The Vishnu trail is signed and marked and makes a nice walk. The trail starts under the tower. It is well marked with trail signs and cairns. The tread is reasonably good the whole way and is an easy grade throughout.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.