Reconnect with your spiritual side and meet other worshippers at Nautical Museum. Quietly reflect outside for a while or ask if you're able to join the next service.
You'll have no end of sightseeing choices when staying in Castletown. Nautical Museum is an ideal place to start here, but there are loads of other worthy places to discover. Port Erin Beach, St Mary's on the Harbour, and Castle Rushen are near the house of prayer and will fill in your day nicely.