There are two, two day float choices; the lower and upper sections. The lower section starts at Buck Hollow just below Shears Falls and you float down to the takeout at Haritage Landing just up river from the Colombia. There are no big rapids along this stretch except for Rattlesnake Rapid just before the takeout. It's a nice float through awesome canyon scenery. There is camping along the way and some with restrooms that self compost by a solar powered system. Kinda cool. However, regulations dictate you will still need to bring a porta_potty. I'll get to the shuttle service later.
The upper section starts at Trout Creek and the takeout is White Beach below Maupin. The rapids in this stretch include White Horse, Buckskin Mary, Wapinitia, Box Car, and Oak Springs to name a few. There is even a body surfing rapid just below the White River. Camping is available but somewhat limited but unlike the lower section, camping is done on the east bank only unless you want to be run off or pay a fine by Warm Spring Indians.
IMO, River Trails is the best and most convenient raft outfit in Maupin. We gave our business to them for 20 years and never had a bad time. Not only do they have good equipment but they will drop off and pick up your rafts and provide dry bags and straps. There is a car shuttle service that works with River Trails but you will need to arrange details with them. JoAnn at River Trails has their number.
If you want a more simple plan that provides more action and less hassle this is what I would do for your bachelor run. Assuming this is a weekend gig, arrive Friday and camp anywhere between Harpham Flats and White River campground. Party all night Friday and arrange to have River Trails drop off your rafts Saturday at Harpham Flats
(RT operates a shuttle bus between their shop and Harpham but most likely you will need to shuttle some cars at both ends yourself) then float down to White Beach. Party again Saturday night and do the whole thing again on Sunday. After you pack up camp on Sunday, drive into Maupin, and, while you're eating ice cream, look at the pictures they took of you going over wapinitia, box car and oak springs. By this time it should be about 4:00 and you should make it home by dinner.
Remember, Oar rafts carry gear and 4 people comfortably and paddle rafts can hold 8. Let me know if you need advice going through any of the rapids.