I would like to see some more unique locations that are designed to be places to just hang out. Some ideas would be maybe a pub/tavern with social seating arrangements... or maybe a public pool area, with Plexus-like physics and an underwater theme.
With some clever coding, there might be ways to add some very basic interaction features that might make it possible to play simple games (either ball games or maybe board games)... or maybe spawnable objects like the Gameshow that could be interacted with by more than one player. Trivia games maybe?