Meditation is it, says Upamanyu to Lord Krishna

नास्ति ध्यानसमं तीर्थं नास्ति ध्यानसमं तपः |
नास्ति ध्यानसमो यज्ञस्तस्माद्ध्यानं समाचरेत् || 28 ||

There is no tirtha (place of pilgrimage) like meditation; there is no penance like meditation; there is no Yajna (sacrifice) like meditation; therefore meditation should be practised.