Hi,
You will have a great time, there is entertainment from morning til bedtime if you want it. Kids clubs are great fun , mini disco on everynight before the main show starts, the bar gets packed quite fast so get up there early for a seat.
The little mini golf place i mentioned is just up the back lane from Donaire as is Bees knees. If you want more to do then Salou is not far, it is cheaper to get a taxi at night as bus fares go up after a certain time (7pm if i remember right).
You can go to Barcelona by train or you can get the coach which stops just along from the hotel, it cost 17.50 euros last year return and i think half price for children. It is a great day out we went to Nou camp stadium and the Zoo.
Obviously you know about Port Aventura and Costa caribe, its great, lots to do and see.
Aquapolis waterpark with the dolphins and sealions is right on your doorstep. The friday market is behind it.
Getting the bus on the same side of the road as the hotel will take you to Tarrogona, this is a Town with a big shopping centre, high street and has markets there too, it also has old roman ruins and if you walk far enough down the high street you will see a beautiful beach.
You can go to a safari/water park called aqualeon, the safari bus passes along the resorts (in peak season i think) you can check it on the net, i will see if i can find the address.
You can do jeep safari with the reps or you can book it seperately, i know that there are offices in Salou but i dont think there are any in La Pineda.
Hope this helps
Loulou