People love vouchers! When your customer sees a voucher in their email or account, they feel compelled to use it. It is an attempting invitation for customers to come back to your venue within a limited time period!
Vouchers can be physical or digital, being the latter ones the most commonly used nowadays, and they are a great marketing tool to reward customers while they have fun at your venue, for example for their spending habits at your center or even for booking many activities with friends or just to provide your activities with discounted prices.