La Manga / Murcia - what are your tips for things to see and do?

[NoNickname]

We're off to La Manga in May. I've not been to that part of Spain before and would welcome any ideas of things to see and do - including recommendations for restaurants please.

Ds is 4 and we give him some beach or pool time most days, but he's also great at just chugging along with us and enjoys all sorts of things like sight-seeing, eating out, etc.

I'd definitely like to visit the town of Murcia - is there anything there that's a must-see? Any restaurant recommendations?

And what else would you suggest?

Anyone?

And again?

Please?

Hi, we were there last year for 2 weeks with DS (7) and DD (3).
We were not in actual La Manga resort, which is kind of in the middle of the country - but we were nearby on the coast.
We enjoyed the town called Cartegena, plently of things to do there, old stuff/museuems if you are into that kind of thing, a harbour with naval boats, etc. You can go on boat trips from there too. There is a good pedestrianised part - and a beach too.
Rest of time we were mainly at the beach/pool.
Oh yeah, there is a good Go-Kart track, its very near La Manga - and they have a kart for all ages (even your DS!)
Can't really recommend any specific resaurant- we were staying right down at the tip of 'the strip' beside a lovely marina (in a lovely appartment rented off a Mner).

Thank you MrsBoo - I was starting to think I'd struck a blank and no MNers had been!