hello mate, i know its a long shot and you may not remember, but do you know what i have to do to find the forest of thieves? i just finished the tree boss thing and it says i still have the forest of thieves to do and the hidden lake boss (i dont know where he is either lol) if you dont its fine.
Well, I didn't remember, but I do still have the game, so as far as I can check...
To get to the Forest of Thieves, assuming you don't have any other intermediary:
1. Most likely to have warp point is Juki Mining City. Go north from there to Akyuu Mines and traverse them. You'll reach an "Ancestral Village" and from there, going to the right takes you to Mori Market. Going up and then left there takes you to Libra Road.
2. Libra Road also has a warp-point, if you already have this one, start from there. Going left (West) from there takes you to the Forest of Sap, which you need to cross to reach Metus City. North of the second section of the Forest of Sap is the Witch Hut which also has a Warp Point you can use.
3. Regardless of how you got there, you need to pass through Metus City to the top (North), grab the back gate Warp point and then head north to the so called Forest of Thieves/Bandits/whatever.
As for the Lake Secret boss, that's somewhere in the Suigestsu Lake, which is at the end of Suigetsu Forest. You'll get access to this one through a story event from what I remember because there's no direct route to it. A warp point will be provided for you or some such, though I don't remember when or how.