Budhist monastery rituals
I believe Singapore can be a good stop to visit many Buddhist Temples from different regions. There are


Thai Buddhist Temple
Burmese Buddhist Temple
Sri Lanka Buddhist temple
Buddha Tooth Relic Temple and Museum at ChinaTown


For meditation, it might be quite difficult as you might need to join a group to mediate in a specific place or find a quiet place inside the temple to meditate.

If you are visiting Yangon in Myanmar/Burma Country, you should definitely visit Shwedagon Pagoda. You can find a lot quite place to meditate and you might also see a large crowd celebrating Buddhist festival at Full-Moon day.