yes, the boat trip is expensive. It starts slow passing a couple of marinas.The deeper you go into lake, the better views. Monument Valley you are going down!!! It takes over two hours to get near the Rainbow Bridge marina. Be on the look out for the "narrows" ~ the incredibly narrow canyon with gazilions curves/turns for the last 10 minutes of the trip. The short hike to the bridge is amazing. It looks like hiking in Zion ~ huge-huge rocks around. The bridge itself is gorgeous with the feeling of seclusion, and greatness. Some people don't respect voluntary rule posted everywhere. The Navajo Nation asking all visitors to respect their believes and to not go under the bridge as it is their sacred place. Let's hope that all trespassers (many) will be penalized by the Great Spirit. In the place like this you could almost feel its presents.