1. Customer room bookings (add rooms and Booking form)
2. Food ordering (Kitchen orders, bar orders, bbq orders etc)
Those are very specific tools and not related to accounting as simple Items bought/sold are.
You are probably better or finding a way how to make those systems talk to accouning software.
In really simple terms, when booking/order is complete and ready for invoicing, data is sent to accounting back end for generating invoice and so on. Simple SOA, if you may.
I am not aware frontaccounting has a service "listening" for external input from other applications.
Many of our suppliers are sending out invoices as a specially formatted XML files. I can bulk import those to bank and skip manual entry for payment details. All I need to do is confirm the transfers and I am done.
I wish I could get this data in to frontaccounting 
but I am not a programmer.