Hello , a very good idea is to add social buttons on the object detail - booking page (ex. facebook like - twitter - google + etc ) that the client is going to book.
Also you can add a playable video sample ( on a small div ) on the object detail - booking page that the client is going to book so that he can watch it on youtube
You can add some coupons (ex. daily,monthly, weekly or when a client registers for first time or when a client books for more than a time )
Thanks !

Hello, thanks. Everything is good idea.