Hi quim,

we did this tour last spring.
We startet from Rovinj in Istria, traveled to the ferry in north west of cres. This ferry is opend during the whole season. Then we toured down south-east to the town Cres an later down to Mali Losinj. From there we didn't get any normal ferry to Rab or Krk. We had to take a smal fishing boat and they took us € 150,- for the trip to Rab. in Rab we had the same problem. No direkt ferry to Krk. So we had to take the ferry on the north-east side to reach the coast and then traveled back on the "coast-road" to Rijeka. Good ferry-conections you'll only find from june till end of september. Traveling along the coast-road with bike is no fun.
Traveling on the islands is beautiful. Attention: there is no flat way . You climb up to 300 or 400 meters an then tour down again. Your kids should be used climbing hills.
If you want to see some photos and the plan of the tour, just send your e-mail adress.

cu

Oli