Looking for Lisbon restaurant to seat 16, not too expensive and with good views for non-tacky hen party fun!?

Sixteen of us are descending on Lisbon at the weekend for my friend's hen party and I'm looking for a restaurant to book for the Saturday night. We are between the ages of 25-38 and looking for drunken, yet civilised and cly, fun and there won't be a printed t-shirt, L-plates or condom in sight. Somewhere lively with good music, reasonably priced food and nice views would be perfect. Please help!