Notester82: ..Sometimes I don't get the Guests' actions... An example: "Guest 21: 'I need to go to the bathroom' *places him next to bathroom 6* *guest heads for bathroom 8*" ..Stuff like that. Am I doing something wrong or is this how the game was programmed? (I'm not really saying I hate RCT1 because of this, but it just seemed a little annoying. .-.)
I've had little to no success picking up peeps and dropping them where they supposedly want to be, only "leaving the park" often works, mostly given up on it otherwise.
If a peep is not heading somewhere currently, it can work if you watch which direction he is going, pick him up once aligned correctly, then drop him in front of the loo so that continuing in that direction will get him inside without other intersections before he reaches it. Not foolproof either, but worth a shot, they continue walking as they did when you pick them up until the next decision point. No clue how this intersects with heading somewhere, thats too messy for me to understand. But generally assume a peep wants to walk straight ahead if possible, they are far more likely to bump into shops, rides, the right road, if they don't have to decide to go round a corner to do so.
Being picked up is a slight mood drop, as is the need to pee, you can't really win here. As long as they don't think "cant find bathroom n" you're probably good anyway, they will eventually get there. I sometimes play paid admission parks without any toilets, doesn't prevent 999 rating or anything, bathrooom need is a really minor problem for your peeps.
Just rambling here as I don't have a real answer. That "walking straight ahead into stuff" is incredibly useful to direct the masses where you want them. We're probably not supposed to manually put peeps where they could walk on their own, might be my lazyness speaking here, I just cant be bothered to do it.