Scotland in a 7.5 tonne Horsebox conversion

Hi, we have just come back from a fab trip around parts of scotland in our motorhome, Blair Castle horse trials, some of the west coast.. and are off again in October.   We hope to visit the lower part of the west side this time, Ayre with a possible trip on a ferry to some islands.   We really enjoy mountain biking, not too rocky( we did the west highland way...not advisable on a bike lol!! ) but off road if possible, fishing, horseriding and outdoor sport but all within a cycle range or walking or on a scooter thanks in advance...ps roads must facilitate for a 7.5tonne.  We are self sufficient and prefer a quiet site x