You should have enough space to have a tub and a shower, depending on the size of vanities, placement of doors, whether you need a toilet enclosure and where the existing plumbing is located. It may be tight, esp. if you want a decent sized shower. Moving the toilet is a PITA. The more plumbing you keep in its original spot, the cheaper it will be. For a quick and dirty (and free) mock up you can use the arrange-a-room tool at BHG. First you specify your room size (unfortunately, their minimum room size is 8 feet by 8 feet, so you'll have to specify a room size of 11 by 8 and ignore one foot of it). Then you pick from among a variety of plumbing fixtures (look in furniture and select bathroom. You'll find toilets, sinks, vanities, corner and regular showers and tubs, etc.). You can also add windows and doors (look in architectural items) You can rotate all of the fixtures, specify sizes, etc. by clicking on info once you drag the fixtures into the room. The program allows you to save, retrieve and print out up to 25 designs. Nothing too sophisticated, but it's easy and it does the trick. Here is a link that might be useful: arrange a room

Ok. Based on the measurements I would do max a 43" vanity (I believe 42" is a standard size) but have it flush to the wall with the door. So leave that extra room where you have the garbage can. Then you can center your toilet in the remaining 36" You don't want it to feel super cramped. I'd have a pullout hamper in the vanity if it's important to keep in the bathroom. If the room is 6'7" long and the tub is 5', what is in the extra 1'7"? Trying to picture your shower options. You also want to leave 24" in front of the toilet, so I'm trying to think how that works.

The area that we are designing is 10 feet long and 4 feet wide. We are demoing everything and starting from scratch to build what we want. See the pictures -- we will be building in the space currently occupied by the bathtub and the shower with the arch in the middle. We are planning to demo the arches so that section is open from the floor to the ceiling (with the exception of the glass panes / doors we install for the shower). That is optional and we don't have to demo them. Another possibility is just demoing the middle column and leaving the columns near the top of the ceiling. We are re-doing everything else in the bathroom, so we can start w/ a blank slate. We will install new cabinetry / sinks and floor tiling. The vanity will be a little shorter so there will be more space between the vanity and new shower space (where the current tub is located).

I agree with making vanity area part of bathroom. Without dimensions it’s hard to sketch. A must is removing that wall, putting new wall and door along closet door wall. A. Cheapest - extending shower past toilet and extending vanity. B. Turn toilet, extend shower, extend vanity. Option depending on space, move closet door. C. Move toilet where shower is, put shower where toilet and sink is, move sinks where vanity is.