I think we do need some sort of challenges as stated above. I love doing the scavenger hunt as this gives me something to aim for and to complete within a time limit. I now play solo, because my partner (my personal heli driver) won't play as much on here due to the lag and I don't fly but I do like the zip lines. I wish there were more around the map so I can get to all monuments. Even just little added events help keep the boredom away. Because you can only build a big base so big. Just looked into Convoy mod/plugin and it looks good, I think it would bring everyone who is playing on the server at that time to come together and battle it out.
