Until the beta 1.04, you don't have too many things to do (
- you can fight NPC, but is very very easy
- you can trade to make money, but when you undertand what commodoties you have to buy and where you have to sell, the difficulty disappears
- you can fight other players, but why try to kill someone without a cause?
- you can play as a pirate, trying to steal others' cargo
- you can explore the 55 star systems available, but until the "explorers career" won't be available, you won't be able to save any data of what you see, so it's useful only if you want to take a picture with the "Stamp" key of your keyboard
The missions available give you a reward equal to 1/10 of the profit you can make trading and there's only a few mission types (only 4, I think) available until now.
You can't go to a star system to another with every ship of the game (that are 13 for now), because the "jump" ability is still limited and some of them can't jump beyond one system, so if you liked one of those ship, you would be stuck in the same 2 systems.
Frontier Developments, that's working on the game, gives news very rarely, so you can't know when will be released an update, or when new features will be implemented.
It's a great game (the flight and combat systems are great! And also the graphics is beautiful), and I suggest you to buy it the final release for certain, but pay attention to little more critical points of view than those who say "It's a great game, buy it NOW!" (I did it so, and now I don't know what to do, only make money that one day will be erased with the new pase of beta).
You could wait when something new will be released, a beta 2 or similar.
So, good choice
