We booked a two bed apartment with Hotel Cartago direct which was much nicer than the hotel rooms and works out cheaper than a package holiday.
You can drink at any of the bars in the complex and eat at the snack bars, including the Tapas Bar and the Mexican regardless of which hotel you stay in, but you have to book to eat in a different restaurant.
Depends whether your children are girls or boys - there is beach football, killer pool, water polo, volleyball, tennis, table tennis, canoes, windsurfing, banana boat etc. Can also hire bikes from the Beach Club.
The evening entertainment is good fun when presented by Zorro - although they are all audience participation shows (unless he comes up with some new ones for this year). Music acts have been o.k. and Thomson show is as you would expect - pity they are not on one of the nights when you could catch a bus to Ibiza Town!!
My 13 year old daughter loves it at San Miguel and my eldest daughter who is now 18 has been three times with us and enjoyed it. If you go during school holidays there will be lots of others in the 14 - 18 age group. Outside of school holidays it tends to be much younger children.
This will be our fifth and (sadly) last year at San Miguel, having rarely gone to the same place twice before finding this beautiful cove- we have thoroughly enjoyed staying there but my husband is insisting on a change of venue next year.
I am sure you will enjoy it