1. If a scenario calls for XXX peeps in clean pool complex, you can block off all paths exept for the one that leads from the park entrance to your pool. Peeps will pour into the pool from lack of other things to do.
2. For VIPs, select the waypoints for the rides they want to visit as usual, but pick them up and put them in the queue line for the rides they want. Likewise, when they want to leave, put them near the entrance. This especially helps for VIPs that have low litter tolerance.
3. For more cash income, construct a park where it is necessary to use transport services to get around, then charge them for it (Island Hopping is a good example, you can use the boats instead of bridged pathways). Be sure to keep plenty of ATMs around when they become available. If your peeps run out of money and can't get more, they will leave.