Implement a booking system in Wordpress site

I need a booking system implemented in to my Wordpress site. The website is for a cooking school and the booking system is to allow customers to book and pay for cooking classes through the site. The booking system must be: Easy to use Easy to update Integrated with Paypal Integrated with a Calendar Must not allow over booking Must be easy for users to navigate I don't mind if you use an existing booking wordpress plugin or if you create your own, or if you link to an external booking system or whatever, as long as it works and is EASY to maintain/update and is easy for users to place bookings. The winning bidder must also provide detailed instructions on how to use the booking system (e.g how to add/create/modify/delete bookings etc). The cooking classes range from single day classes to classes that span over a 6 week period (e.g 1 day a week for 6 weeks). The booking system must be able to cater for this.