I’d go on an expedition. Himalayas in April or November. Alaska in the Arctic summer. Or South America in their summer. In 2016, I had a month long sabbatical and spent it in Nepal, which was worth every minute.
There is an early project for the .eth TLD to support DNS queries so that you can't point to http. I assume that should work with https too. But the ethereum blockchain can only run dapps.
I'm most excited for the mountaineering / backcountry application in the short term but as critical mass develops in urban areas, there could be an interesting ecosystem that develops around this even without repeater functionality. Anything from people discovery like Tinder to b2c interaction like OrderAhead could build on top of a comm stack like this.