Hi Anna,
Theres plenty to do if your 5 year old is over 1.2 meters as this seems to be the height restriction for the majority of the rides. and they are VERY strict on this !
All in all there are 11 rides which are considered 'kids' rides, but on top of this there are a further half a dozen rides you should be able to use as long as their accompanied by an adult. My 5 year old really enjoyed the 2 rollercoasters, Tami-Tami & Tomahawk, and amazingly was able to ride the El Diablo, runaway train to you and me, when I accompanied her.
On top of this there are 14 shows, don't miss the acrobats in China Town, and the Temple Del Fuego in Mexico, and theres also a great playground area also in China Town.
Don't overlook the Caribe Water Park as well as my 2, aged 3 & 5, loved it.
To place a figure on my daily budget is a little difficult as most of the days we ate really well at breakfast meaning come lunch time we weren't really hungry. We ate again around 7pm and because it was a buffet dinner, again we ate really well !
I was expecting the park to be really expensive, and although it's a tad expensive, I wouldn't say overly so. A pint of lager was around £2, and a botle of Coke being about the same, Hot Dogs & Burgers were £2.50, and Ice Lollies and Ice Cream being anything between £1 - £3. Please note this is only a rough guide !
A couple of tips ;
Top up with juice at breakfast. My 2 daughters both had there own juice cups and filled them to the brim before we left each morning. You may also want to take a couple of pasteries at breakfast as well, I wasn't keen on doing this at first but everyone seemed to be doing this.
Try to avoid the park in the day time as it gets so busy and the heat is unbearable.
The (bigger) pool area in the Hotel is amazing, make good use of it.
I always managed to get my daughters back to the room around 4pm and let them sleep until 6pm, this way they were able to enjoy the park right up until midnight every day !
Try to do the park in zones, this way you'll not miss anything, also plan the shows you want to see in advance and plan your day/evening around them.
The park is VERY big, make use of the Steam Train and River Boat to get around the park, and don't what ever you do forget your buggy
The big show at the end of the night starts at 11.45pm, make a point of getting there early one night to enjoy it, I found the best view was at the 'beach' area as you enter the park form the Hotel.
We visited Tarrogona which we got a taxi to, it was Ok and I'm glad we done it and it made a good change of scene. Theres a small shoppingg mall there which we visited and then walked to the main square which has an amazing view of the ocean and a near by Amphitheatre which was well worth a look, did have trouble getting a taxi home though and spent 30 mins looking for one !
I know you'll have a great time, and if you have any further questions...don't hesitate to ask
Jazza