I think that if you book your own flight and accomodation seperatly then its just not worth going for the weekend, you may as well make at least a week of it. With package holidays you pay a fortune just so holiday reps can sell you overpriced days out. Book it yourself and you can get bargain flights and hotels at their REAL value which is much more affordable than the price that holiday companies charge so they get their cut. The hotels are actually quite reasonably priced if you book them yourself.
Screw the weekend, go for a week! If the boss complains... tell him where to go!