I purchased this to go with a large Playmobil pirate ship.
It contains lots of pieces to set up a little scene with pirates and their loot around a table. The pirates are cool and come with accessories and have tiny bits of gold and treasure. But that's about it. I'm really glad I bought it as an accessory to the larger ship, as on it's own I'd imagine it could be a little disappointing.
There are also quite a lot of tiny weeny pieces, (little gold coins, and tiny rocks and stones) so I would advise anyone to be careful as they could get lost really easily if not looked after.
As with most 4+ Playmobil sets, I'd say for a careful 4 year old, they're fine, but it could be a bit too intricate for a more boistrous child.