The resort is nice and flat for your parents. Depending on your childrens age there will be enough to keep them amused. My 2 last year (age 10 & 4) liked to play football in the square whilst we had a quiet drink (with all the other children of every nationality). The youngest liked to watch the locals building the amazing sand sculptures on the Pine Walk - he would just sit mesmorised for about half an hour. there is an arcade with airhockey, shooting games etc... and the boats in the marina were great to walk around at night and imagine which one we will buy when we win the lotto!!! There are lots of little stalls on the Pine Walk selling jewellery, the children can paint pots, portraite painters etc... Oh and it is great for people watching.
Restaurants were all excellent - we did take colouring pencils for the youngest as sometimes there was a slight wait as they were really busy. Staff were always welcoming to the children and they never minded them getting up and looking at the lobsters in the water etc...
Enjoy , it really is a lovely place.