I like your optimistic outlook on life!
Having cash (especially Kina) can be summed up with an experience I had a year or so ago at POM. Short term arrivals business visa used to be PNK250. Without notice and without fanfare the PNG gov't decided PNK500 is fair and increased it (CPI be darned).......overnight (or within a week I think it was)! I landed with no prior notice, no press release, no incoming pax notification, no web site change and with what I thought was a prudent amount of PNK400 in cash.......PNK100 short! No cards at immigration (alright, there is an ATM but that's only relatively new) and luckily the cash exchange next door to arrivals visa desk accepted AU coinage and I was able to make up the extra PNK100 with AUD that I had in my wallet (Relying on coinage I might add). To make matters worse, at that point I was determined to have just one card.......and that card had a week left on the expiry (I was only out of country for two days), but they had posted the new card out and stopped the old card. I gained a new found appreciation of cash and a selection of new grey hairs! Luckily, by the next morning, my old card was working again and my resolve to have more than two backups, even for short trips, was hatched.