From my experiences as a civie, most people either came as a group or as a couple so.... you're best bet may be to get a chick tipsy and see how she reacts to the come on. Knowing that you guys came as a couple (and if she's got any kind of experience with couples or bi-tendencies), if she responds in a positive matter then you're good to go
Now, of course you'll need to spoil the mess out of her but, everyone will be happy all around
it's out there..... Have a great trip and let us know how it worked out for you