cookstoronto, March will be a beautiful time to visit. But of course it's weather...as I sit here in Roatan writing this, it is a beautiful, hot, not a cloud in the sky day...we'll be going to the beach shortly and guess what? It's February, the rainy season.
I travelled here with my 2 granddaughters last year. They were 6 and 11. I ensured that they got their Hep (I think there's an AB now) as I think that is important for all travelling. We did not take Malaria meds. We stayed on our house of course but hung out at West Bay Beach which is amazing and the kids loved it!!! They also enjoyed our community pool very much so my advice would be to also stay where there is a pool cause kids sometimes prefer it over over the ocean.
What I highly recommend with kids is a VERY well stocked first aid/medication kit. Bring anti itch (oral and topical), children's motrin, cough/cold stuff, of course sun tan and bug stuff for kids, tummy medication...just cover all the bases. That stuff is available here but you would have to go and find it which will be a real hassle. I never needed to use any of ours but it was nice it was there...as everyone knows it's horrible to have a sick kid and not have the things you need to deal with it. Then, instead of taking it home...leave it here...maybe at Clinica Esperanza or even if you see a local family with kids just give it to them.
As far as gifts go...we bring stuff every time we come and one time were distributing things in French Harbor and it amazed me that the kids kept calling out for books. Somehow I just don't see books being at the top of a kid's list in Canada. So that's what I would bring...books and coloring books and crayons (pencil not wax).
Your kids will have a ball...don't be worried....they are usually better travellers than adults.