Get in touch with your spiritual side and offer up your own prayer at St. Casimirs Church. Explore outside for a while or find out if you are allowed to join the next service.
If you've got time to stop for a while in Vilnius, St. Casimir's Church is a fine place to kick off your exploring. This house of prayer is one of many attractions worth seeing here. Vilnius Town Hall, Vilnius University, and Vilnius Cathedral are also waiting for you nearby.