Aunti-Mgeorge, welcome to FROG, we're glad to have you as a member!
I've not been to Seaside, so can't give you first-hand information. I'm relying primarily on the information from the folks organizing the trip who have been there on their own and in groups, as well as on the reviews on www.rvparkreviews.com
Out of 43 reviews on rvparkreviews, 21 give it a rating of either 9 or 10. 39 have ratings of 7 or above, and two more give it 6. Several groups, such as RVing Women, rated it at a 10 for how the park handled their groups, so I'm feeling pretty confident about it.