Hi Neal
Like Spr says don't waste your petrol if you are there already .
If the lake's very busy why not watch what the other anglers are doing like a hawk , and not try and be noble i.e. if someone catches go and congratulate them on their catch while getting a sneaky look at their rig and / or their bait . Is that so bad ? , the angler who catches may be chuffed that you are happy for him and you've got an idea what to try when you are in a " better " swim - it's not as though you are going to cast into their part of the lake ! .
Keep warm , and tight lines .