A good question.
A local answer.

Check evening food and groceries near the exact building. Teenagers may value a walkable neighbourhood as much as a shorter theme-park transfer.

Compare travel time with the hotel's pool if you only have a short window. The best choice changes with tide, swell and weather.

Mix a supervised beach or pool morning with a wildlife, rainforest or hands-on attraction that fits the child's interests. Avoid making every day another theme park.

Use layers that can be removed during a warm afternoon and put back on after sunset. Check the actual forecast and wind, not a fixed winter packing rule.

Choose one base that makes daily meals and naps easy. Then select a few major outings rather than trying to visit every park, zoo and aquarium.

If dates are fixed, visit the biggest attraction on a weekday and book early. Keep a beach or pool day flexible for weather and crowd levels.

Let each teenager choose one priority outing, then limit the number of full park days. Mermaid Beach is a useful calmer base for beach time between bigger activities.

Price accommodation or holiday-park parking as well as fuel and rental. If the children mainly want beach and theme-park days, a fixed base may be easier than moving the whole family each night.

Pick accommodation by the practical routine: room space, a pool, laundry, nearby food and how far the beach or tram stop is on foot. Confirm the facilities on the property's current site rather than relying on a resort list from a forum.