In reply to J1234:
It doesn't shine at those grades but there is plenty of fun to be had for a weekend and all the crags can be accessed by bus as directly as by car if a little less conveniently. If the Chasm's is banned then your options reduce but there is still enough to entertain. Assuming the Chasms is banned:
Kione y Gogghan located between Port st Mary and the Chasms has a good collection of steep seaside routes in that grade band and some bigger cliffs with the odd wandering route and loads of climbable rock to explore.
Aldrick located between The Sound and Port Erin has a bit at these grades.
Groudle has a few good routes from seaside ledges in these grades.
Santon pinnacle is tricky to find but has a few nice lines at these grades.
http://www.mike-caine.com/climbing-introduction/ Very out of date and lots of the routes described and some of the crags are not as they once were! A local contact would be a big help.
jk