Booking international holiday, what are some things to consider?

a friend and I are planning a five-day holiday to Singapore in October to see a concert. This will be our first international trip without our parents and we’re just asking for some tips on planning and flying abroad.

So far, we have jotted down.
- Get passports up to date
- complete SG Arrival Card 3 days prior to entering singapore
- shop around for travel insurance (any suggestions would be appreciated)

That’s all we’ve managed to come up with but please let us know if anything else is missing.

Thank you!