I traveled to the world's least-visited country, which may disappear by 2050. Here are 7 things I wish I knew before I went.

The Tuvalu Coastal Adaptation Project pumps sand from the seabed and deposits it along the country's shoreline to combat rising sea levels.

Courtesy of Amanda Coffee

• Tuvalu, a tiny island nation, may be underwater by 2050 due to climate change and rising sea levels.
• Writer Amanda Coffee found a good flight deal and visited, enjoying the safe, welcoming vibe.
• Tuvalu visitors should plan ahead, bring cash, and expect friendly locals and limited food choices.

I...