Given a travel related situation, and given a specific question about the situation, summarize the question into a title

[Q]: I am planning to book an early morning flight from Reykjavik to Berlin via Wow air, its departure time is 6:10 am. 

How easy it is to reach Keflavik airport early, is it easy to get airport commute so early in morning? 

I can see all Wow air Europe flights depart almost at similar times, so airport will be crowded, any idea at what should one plan to reach airport?

Edit:

Correct above, its Keflavik airport not Reykjavik but its the main airport for International flights.

Update:

I booked Grayline pickup for 3am and it dropped me at airport by 3:50am. I had no problems and reached the boarding area well in time and even submitted my tax refund form.

[A]: Catching early morning flight in Reykjavik


[Q]: I realise that return tickets are sometimes required for tourist or visitor visas (i.e. Korea has 90 days free for Australians like me)

Just wondering that if I ever plan on entering Korea on a one-way ticket, is it even possible? I will fly to Japan sometime within the 90 days but I'm not sure when.

[A]: Catch a one-way ticket to Korea


[Q]: Looking at website of Guyanese Embassy in Brasilia, Brazil I'm not sure if they issue visas to foreigners:


  We advise that Brazilians do not need a tourism visa to get into Guyana (...) Fees: touristic visa - R$45,00 (...)


Since they mention that Brazilians don't need a touristic visa and yet publish its price, I understand they issue visas to foreigners. There's also a visa form in English available on their website.

On the other hand, according to Polish MFA (information available in Polish only)


  You can apply for a visa in Guyanese Embassy in Brussels or Caracas, Venezuela


My question is, as a citizen of Poland and resident of Brazil, can I get Guyanese visa in Brasilia, Brazil? 

[A]:
Can Polish citizens get a visa to Guyana in Brazil?