We (two of us) will be doing the tours during the high season. We are working with a planner who has helped us get booked into lodging that wasn't taking any more reservations from the general public, so feel some gratitude, and have a slight inclination to use the planner to book our tours.
Mostly what I read on TA is to wait to book activities until one is on-site, in order to assess the weather and to get a better price. Does this hold true even during the high season? Do people get turned away from ziplines and rafting trips?
How much better is the price by waiting to book the day before? 5% savings? 20%?