We're planning on taking the boat across Tonle Sap from Siem Reap to Battambang in mid December. We've read that it can be a much longer journey in the dry season - would mid December count, or is it early enough in the dry period to be okay? Also, friends just came back and told us that there's a guy collecting a20 toll to get down to the lake. Is this for real!!!! Any experiences welcome.