all look like you have some errors with site configuration
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asked correct SEF settings of your joomla website
Look like you incorrectly configured your site.
Please in joomla admin menu Play with "Search Engine Friendly URLs"(SEF)
System->"global configuration"-> Site -> SEO
also please in yours website root folder, rename file:
"htaccess.txt" to ".htaccess"
and in ".htaccess" replace
where "yours_website_subfolder" subfolder ander your website root folder
If "localhost" direct to "c:/root_localhost_folder/"
and your current site in "c:/root_localhost_folder/my_test_site/"
so "yours_website_subfolder" -> "my_test_site"
In your case as me seem "yours_website_subfolder" -> "activities"
Move yours site to Internet - and all for you will good.
Or we will can directly help to you