Aisling,
I agree with you on the utility of the ESERO activities. On the main esero.ie site you can see lots of them, sorted by strand and strand unit. Use the number of the resource to get an indication of the age level it is suitable for – 1-20 for Infants, 21-40 for 1st/2nd class, but of course, you can adapt as needed.
With regards to SSE – I think the science environmental awareness strand could be an interesting focus.