Re: a bath - do you have a big plastic storage tub? We use one to bath DS2 in (even DS1 who is 5 crams himself in it LOL). It's so handy because we need to bring the tub for storage anyway and it means we don't have to queue up waiting for a shower and then have to try and coordinate our small children in the shower, get them dressed without their clothes getting wet in the cubicle etc.

Are you staying in a tent? If so, make sure you have some tarp to put in front of the tent entrance so you aren't trecking as much dirt in. Also bring a broom, kids bring so much dirt into tents. Maybe bring a tub to store your shoes in too, to encourage your kids not to wear them in the tent.

Toys - Definitely some indoor friendly toys are good. We also bring our laptop so the kids can watch DVDs if they wake up early or it's raining. Bat and ball games are always a winner when camping and they don't take up too much room.

Some other suggestions:
* Do you have chairs for yourself and the kids?
* Insect repellent
* Sunscreen
* Hats (for all of you )
* Swimmers (if there is water nearby)
* Beach towels
* Towels for the shower
* Some plastic bags for rubbish, wet clothes, using in the shower, etc.

Umm...that's all I can think of atm. I have a huge spreadsheet with a list of all the things we need to pack when we go camping. It's so handy so I don't need to write a new list each time!

ETA - Another tip regarding showering - Plan to shower at a non-peak time so you don't have to queue.