Rihana should be fine. A reasonably large percentage of Scandinavian guests, 2 decent size pools (one of which IMHO is the warmest in Gouna) and two minutes walk to "downtown" from Reception. Low key animation team activities by day without any pressure to join in boules or aquarobics etc, but something to do if you are bored of sunbathing.
Have never actually stayed there as we have an apartment in Gouna - but kids like to go at least once per trip for the buffet (which has pretty good range of food - "Standard" buffet fare, and loosely based on a different international theme each night). Also has the "Chez Pascal" restaurant on site which does some wicked steaks!
Buy a weekly bus pass for £1.50 from hotel reception or the information centre in Downtown. This gives you the run of Gouna on the buses which run every 15-20 minutes (direct to the Marina from the Rihana) , or the shuttle boats.
PM me if I can help with any other info and have a great trip