So then I had £30 million quid and no missions left to do. Whats the point of that? Apart from the bore-athon of collecting the spaceship bits and the letters is there anything else worth doing?
There's plenty to do, but it depends how easily amused you are. Here's a list of some of the things I do just for laughs in GTA single player:-
-Buy the tank and the cargobob, and lift the tank to obscure places (like rooftops) and shoot the crap out of everything for the next half hour while the local law enforcement goes crazy.
-Drive on to the runway at the airport and crash into planes as they're taking off. They blow up and fall to bits in a comical "clown car" style.
-Steal a jet from Fort Zancudo airbase
-Kit out a car that and go for a drive through Rockford hills and Vinewood hills - my favourite one for this is the Comet as with the right moves you can kick the back out and drift round corners.
-Steal a truck with a trailer on, drive up next to a muscle car and pretend you're smokey and the bandit.
-drive around randomly sticky-bombing cars and generally cause carnage in good old classic GTA style.
-kit out a car and drive up mount chiliad. The Karin BeeJay XL is surprisingly good for this as it's true 4WD (the Sandking is not). Go for max armour in case you take a tumble. The engine mods help give you the extra juice to get up the steepest parts.
-steal or find the Enus Super Diamond (Rolls Royce?), kit it out with max armour and drive around crashing into things. The car is so heavy and tough that it'll tip other vehicles or even cause them to fall apart like something out of a cartoon. Expect death eventually, but it's fun...
-Lastly, meet up with the other characters and go for a good old fashioned p***up. You can also get an achievement while all three of you are in the car by annoying the police to 3 stars and then just escaping them.
I found the 30 submarine parts (triggered from a remote pier at the top left) and expected a bit more of a reward than just a little bit of cash.
Apparently it's not about the cash but about the car the woman gets in when you finish the mission. If you kill her as she opens the door you can take the car, which is the rare Asea. You can then
do this to it at a garage. I haven't done it yet myself but the word is you have to shoot her before she gets in and closes the door, as it locks and you won't be able to take the car.
Bit like Michaels 5 mile walk in the Kifflom story. Although the "reward" you got once you completed the Kifflom missions was hilarious, well, pretty funny anyway.
If it's the tractor you're talking about, you took the bait. The "real" reward is to get in the blue Audi which has over a million in the boot and floor it as soon as you get out onto the open road. If you manage it without getting rogered by the police and the Kifflom security (it's not that hard, use a tunnel) then you escape with the money and a blue Audi. You don't even go to the final meet.
I've given up with the game now, to be honest I'm bored of it. It's fun to muck about with a bunch of mates now and again but that's about it, you soon get skint with buying ammo from all the rampage. Rockstar have killed online. They make it hard to earn cash so they want you to buy their cash cards. Every time I find a mission worth grinding for cash they go and nurf it or by the time you have done a few missions and need more ammo you end up skint again from restocking, and they wonder why a lot of people have cheated and still do...cough cough

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That's not the worst bit about online, the fact that they "fixed" tank sniping and appear to have altered/reduced/removed the bad sport system has made it greatly unbalanced. Sniping people in tanks was the great leverage to tank trolls, and it wasn't difficult to do once you'd gotten the hang of it. Now they "fixed" that there's no easy way to leverage a tank anymore.
LINK to tank sniping.
I actually bought a tank fairly early on in online when me and my mates caned it every night. having a tank was a great thing for crowd control, as it doesn't matter how good you are, when 5 people at once decide to start picking on you, you NEED the backup. The tank was the perfect crowd thwarter, but a lack of means of leveraging it just means everyone drives around in them now, and online has pretty much become "Grand Theft Auto: Baghdad edition"...
If anyone still plays online and wants someone to kick back with I'll be willing to have a go. I have a K/D ratio of 5.5 and can teach most people a thing or two about how to be awesome in a buzzard helicopter...