Ax-Les-Thermes
This resort is well east so avoids the worse weather in the western side of the Pyrenees and it’s near Andorra.
You have thermal spas – free to access- a swimming pool, lovely town centre, 5mins ride from the Municipal site to the cable car up Ax-Bonascre. This has lovely natural trails littered all over the mountain and has excellent Liasons back down to the Town, for the end of the day.
We have been twice and in July it’s quiet, unless it’s a day or two before the TDF -which often finishes there.
There is topos for XC routes around the valley too.
You can take kids up the side valleys or up toward Andorra for amazing lakes etc.
Outside Ski Resorts, we have found the VTOPOS very good. They have graded routes, all with 1-25k maps and good descriptions. You can also download the routes as GPS tracks for a few euros more. They have longer routes or shorter routes. We have used them in Grenoble, Alpes Maritimes and Provence areas and every route has been worth repeating.
http://librairie.vtopo.fr/