My girlfriend from Philippines is planning on visiting me later this year on a 6 month tourist visa.

I was wondering if we could take a holiday in that time, either through a tourist agency or independently.
Does the 6 month UK tourist visa allow multiple entries to the UK?

I liked the idea of a cruise, which would be booked through an agency and I travel often to Morocco where I believe a visa isn't required for Filipinos.

I would appreciate any advice from others who have done this, or looked into it.

Thank you.