Hi Mick, As you can see we on here are pretty passionate about Goa and all things Goan. On the whole we have a love/hate relationship with the place. We all love different things and we all hate other different things that occur there. You MUST go to Goa with an open mind and give yourself a few days to adjust. Goa isn't for everyone however, if after a few days of acclimatizing you haven't fallen in love with the place, its culture and its people I will promise to eat my hat
As others have said North is best if your daughter wants "a little more action", North is vibrant, eclectic, totally overwhelming to the senses. Certainly a lot more to do/see than the South. If you just want peace, quiet and a more relaxing environment, go South. Whichever you choose, you will still return home feeling chilled to the core (and find it difficult to get back into your normal routine).
Tips: Do make sure you have a torch on your person at night.
Don't hire a bike unless you are very brave (or IMO have a death wish) anyway your insurance won't cover you. The roads/traffic/drivers out there are MAD!
Do learn to haggle very quickly! Offer about a third of the price they want and work up from there. They won't sell it to you unless they are making a profit - walk away they will soon follow you if they want your dosh!
Don't take toiletries, they weigh too much, buy them there.
Do buy Odomos (mosquito cream)
Drink bottled water ONLY
Do take some antibacterial gel with you (or wet wipes) as very handy.
Don't go all inclusive, too many good eateries/shacks to try. (see restaurant guide on HT for recommendations)
Don't be afraid to ask for a different room if you are not happy with the one you are offered (they will change it if they can)
Do enjoy yourselves and explore as much as possible as its a long way to go just to sit on the beach/or by the pool.
Have a Great time.