Take the boat from Al Kharid (north of lumbridge swamp) , or use the Ring of Kinship to teleport there.
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You can take almost nothing into Daemonheim - or out of it. You can take an Orb of Occulus into Daemonheim, and the Ring of Kinship. Just about anything else will be rejected, and you'll have to leave it at a bank. However, you can pick things up in Daemonheim and use them there.
You cannot wear any armour into daemonheim unfortunately. Inside the activity you will receive armour. Hope this helps :)
It's off the peninsula of Daemonheim.
you can find sinebeam trees in Daemonheim on runescape
There is no way of getting to it, at the moment - it is just there for Scenery.