Some extensions that I may choose to install.
# [[:mw:Extension:CirrusSearch]] because the regular [http://www.searchtools.com/analysis/mediawiki-search/index-mediawiki-search-stinks.html MediaWiki search sucks]
# [[:mw:Extension:WebChat]] used by the [https://translatewiki.net/wiki/Special:Version TranslateWiki.net community]
# [[:mw:Extension:Semantic_Maps]] (or plain maps) for use in displaying hikes, bike routes etc. However, need to discover the applicability of the solution to the problem.