that he would have met Legolas in relation to Gollum. Weren't all of Aragorn's wanderings among men? I never got the impression that he went to Mirkwood, although I supposed it's quite possible.

I've always read Legolas' repeated declarations of his love for Aragorn as an indication that they did not know each other before the adventure of the Fellowship. To start with, there is no reference to any such acquaintance in the story, either from the narrator or from their own dialogue. Of course, given Tolkien's writing style with his minimal depictions of all personal relationships, that is hardly surprising - and with fan fiction... well, who knows what fan fiction can do? Still, it always helps to have some positive indication from an author about something like a pre-existing friendship, rather than just supposing one out of readerly sympathy or interest.

`Alas! alas!' cried Legolas, and in his fair elvish face there was great distress. `The tidings that I was sent to bring must now be told. They are not good, but only here have I learned how evil they may seem to this company. Sméagol, who is now called Gollum, has escaped.'

It seems strange that if Legolas and Aragorn were friends Aragorn didn't mention this little fact to him when he handed over Gollum.

There was also a strange Elf clad in green and brown, Legolas, a messenger from his father, Thranduil, the King of the Elves of Northern Mirkwood.

Although I don’t believe that Aragorn handed Gollum over to Legolas personally (which I’m sure you didn’t intend to convey),...

Elrond was there, and several others were seated in silence about him. Frodo saw Glorfindel and Gloin; and in a corner alone Strider was sitting, clad in his old travel-worn clothes again. Elrond drew Frodo to a seat by his side, and presented him to the company, saying:

'Here, my friends is the hobbit, Frodo son of Drogo. Few have ever come hither through greater peril or on an errand more urgent.'

He then pointed out and named those whom Frodo had not met before. There was a younger dwarf at Gloin's side: his son Gimli. Beside Glorfindel there were several other counsellors of Elrond's household, of whom Erestor was the chief; and with him was Galdor, an Elf from the Grey Havens who had come on an errand from Cirdan the Shipwright. There was also a strange Elf clad in green and brown, Legolas, a messenger from his father, Thranduil, the King of the Elves of Northern Mirkwood. And seated a little apart was a tall man with a fair and noble face, dark-haired and grey-eyed, proud and stern of glance.

'I cannot say yet,' Aragorn answered. 'As for the king, he will go to the muster that he commanded at Edoras, four nights from now. And there, I think, he will hear tidings of war, and the Riders of Rohan will go down to Minas Tirith. But for myself, and any that will go with me ...'

'I for one!' cried Legolas.

And:

'Where is Aragorn?' he asked.

'In a high chamber of the Burg,' said Legolas. 'He has neither rested nor slept, I think. He went thither some hours ago, saying that he must take thought, and only his kinsman, Halbarad, went with him; but some dark doubt or care sits on him.

And:

But as Aragorn came to the booth where he was to lodge with Legolas and Gimli, and his companions had gone in, there came the Lady Eowyn after him and called to him.

'And you have found him also!' cried Aragorn. Giving his reins to Merry, he ran forward and embraced the newcomer. 'Halbarad!' he said. 'Of all joys this is the least expected!'

[cut]

'But I did not summon you,' said Aragorn, 'save only in wish. My thoughts have often turned to you, and seldom more than tonight; yet I have sent no word. But come! All such matters must wait. You find us riding in haste and danger. Ride with us now, if the king will give his leave.'

And last of all Aragorn greeted Eomer of Rohan, and they embraced, and Aragorn said: 'Between us there can be no word of giving or taking, nor of reward; for we are brethren. In happy hour did Eorl ride from the North, and never has any league of peoples been more blessed, so that neither has ever failed the other, nor shall fail. Now, as you know, we have laid Theoden the Renowned in a tomb in the Hallows, and there he shall lie for ever among the Kings of Gondor, if you will. Or if you desire it, we will come to Rohan and bring him back to rest with his own people.' – The Steward and the King

And:

In Gondor the King Elessar now ruled, and in Arnor also. In all the lands of those realms of old he was king, save in Rohan only; for he renewed to Eomer the gift of Cirion, and Eomer took again the Oath of Eorl. Often he fulfilled it. For though Sauron had passed, the hatreds and evils that he bred had not died, and the King of the West had many enemies to subdue before the White Tree could grow in peace. – Appendix A

Yeah apparently there was a rumor a long time ago when the movies came out that Aragorn married Legolas?!?!?! Obviously this was not true.