We had lived in B'ham and Whatcom county for 41 years prior to fulltiming. Still have family and friends there. DW is from Mount Vermin in the beautiful Stagnant Valley. We both have Master's from Harvard on the Nooksack and Juan de Fuca U. (WWU). We return often and stay at Fidalgo RV in Anacortes, Swinnomish Casino and this last summer discovered Mount Vernon RV Park. The latter would probably be best for your needs (now that the I-5 bridge is fixed) but is difficult to get into reservation wise. All three would be good. For that length of time if you stay @ Fidalgo stay in the upper section away from the water front. BTW are you any relation to Ron Petty?
