Went last year, Split is ok but Korcula and Hvar are much much nicer, get the cataraman and be there in a couple of hours.
Also met a bloke wearing a brighton shirt in Korcula.
I went to Bton aquarium last thursday and paid £40 for 2 adults and a 5 year old and Bton aquarium is to London aquarium what Withdean is to Emirates.
The 77 bus up to the Dyke was a win though.