Sadly no other way to see Maeshowe although in fairness group sizes are limited; I enjoyed listening to the guide even if they naturally focus on items likely to be of interest to everyone. Tomb of the eagles is an organised introduction, however, after that you are left to wander the 1/2 mile or so to the tomb by yourself and to spend as much time there as you like there. Close by is the Tomb of the otters (Banks Tomb) only partially excavated and a real treat going inside, must be organised at the local café, no way past locked entrance gate!