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

Q: My friend is coming back to India from Dubai and is bringing a PS4 for me, as it is cheaper there. It is new and in the original, unopened packaging. He has his own carry-on baggage and adding the PS4 would exceed the weight limit. Would it be safe from either damage or theft to pack it in his checked luggage?

A: Is it safe to put a PS4 in checked luggage?
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Q: Wikitravel's Japanese-language guide to New South Wales (Japanese hasn't yet migrated to Wikivoyage), appears to claim that a Japanese passport is required for Japanese citizens to visit the Japanese war cemetery in Cowra:

( Cowra )

Google translate:

Cowra - Cowra There are Japanese cemetery and Cowra Japanese garden. To enter the Japanese cemetery, presentation of the Japanese passport is necessary.

By contrast, Visit Cowra says about the Japanese war cemetery:

Accessible at all times and admission is free

and there's no mention of any restrictions on the Trip Advisor page.

Are non-Japanese allowed to visit the cemetery, and are there any ID requirements for visiting the place?

A: Is ID required for visiting the war cemeteries in Cowra?
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Q: I'm travelling from Munich to Bangkok via Muscat at the end of September (economy class, so no lounge available). The Airport in which I'll land will be the Suvarnabhumi International Airport and the local time will be 8.00.

My parents will be flying with a different plane, which will land at the same airport at 13.00.
Provided that we already reserved our hotel in BKK and I asked if I could do an early check-in, to which they replied that I had to pay a night more (didn't expect that from a 5 stars hotel), I see myself bored as hell, sweat-stinky (apparently there's no possibility to take a shower in that airport), waiting on a bench with all my (heavy) stuff around. I would very much like to avoid that.
What are my best options (money/time/relax-wise)?

Could I do anything decent enough to spend a couple of hours in the airport (possibly having my baggage stored anywhere?
Should I go to the hotel and try to see if they can make me check-in anyway (and try not to pay more)?
Should I surrender to the hotel's policy and have my room ready for me by paying a night more?
Should I go to the hotel, store my things and go out strolling a bit (with jet-lag, without shower and so on...)?

A:
5 Hours (at least) to spend in BKK Suvarnabhumi or what else?
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