IIRC, tree has a maze of anomalies under it, but nothing on the actual tree itself. I think there's one artifact under the tree and one on top that you have to do some acrobatics to get to. Not too difficult for either.
For the exoskeleton, be aware that you CANNOT run in it until you upgrade it with upgrades that require the calibration tools. You will not get the calibration tools for a long time, so if you like running, I recommend that you save your money for a bit and buy it later.
[edit]If you really want to invest in a good piece of equipment from Nimble early-on, I recommend asking him for a Sniper weapon. He sells three possible sniper rifles (random as to which you get), but for the Sniper rifle all three are very good. Tide may well be the best of them as it useful for both sniping and close combat, and takes ammo which is a bit easier to purchase than the other two. Lynx might be the best pure sniper weapon, but cannot really help you up close.
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