Getting Here
FOSS4G will be at the Sheraton Downtown Denver and there are plenty of transportation options for getting here.
From other parts of downtown
The most convenient way to get to the Sheraton from much of downtown Denver is to catch the free shuttle bus that runs along 16th Street every few minutes (a little less frequently later in the evening) from 5:30am to 1:35am. This runs right by the front of the Sheraton (get off at Court Street). This is also a great way to get to other parts of downtown - take the bus to Larimer and walk to the left to get to Larimer Square, or go to Wazee or Wynkoop and walk to the right to get to LoDo (Lower Downtown). Both of these are fun areas with plenty of bars and restaurants. There's also a good stretch of restaurants and bars if you just walk out of the Sheration and take a left along 16th Street.
From the airport
Denver airport is quite a way from the center of town, about 25 miles away. There's a fixed taxi fare to downtown of $54.75 (without tip). A cheaper option is SuperShuttle, who provide shared van rides to Denver hotels. This costs $22 to the Sheraton. You may end up stopping at several hotels along the way. The least expensive option is to catch the SkyRide bus, which costs $11 one way (cash only and they don't give change). Catch the AF bus to Market Street Station, and from there it's a short ride on the free 16th Street shuttle bus (see above). These leave either every 30 or 60 minutes depending on the time of day - see the timetable here. At the airport you can catch the bus on level 5, island 5, outside door 506 or 510 on the west side and door 507 or 511 on the east side - full details here. The bus will take almost an hour, compared to around half an hour in a taxi.
By light rail or bus from other parts of town
Light rail stops at 16th and Stout or 16th and California are both just a few minutes' walk from the Sheraton, and are served by the D, F and H lines. There are many light rail stations with free Park and Ride, which will save downtown parking fees and hassle. Denver also has an extensive bus network. You can use the official route planner here, but we have to admit that the easiest option is to use Google Maps routing (either in a browser or in one of the smart phone versions), and choose the public transport option.
By bicycle
Denver has a bicycle rental scheme with bike stations all around downtown. You can get short term membership at a cost of $6 for 24 hours, or $20 for a week. Trips of less than 30 minutes have no additional usage charges. Note though that you are not allowed to cycle along 16th Street, which is pedestrians (and buses) only, except on Sundays. The closest bike stations to the Sheraton are on Glenarm between 15th and 16th, and at Colfax and 15th.
By car
You can get general driving directions from the hotel web site, or ask your favorite online mapping system to direct you to the Sheraton Downtown Denver, 1550 Court Place, Denver, CO 80202. You will need to pay for parking. At the Sheraton itself, parking costs $6 an hour or $24 a day. There are plenty of parking lots within a few blocks that are cheaper. There is a good selection on 14th and 15th streets between Court and Glenarm, with prices as low as $7 a day - here's a map with parking locations and rates (though you'll have to zoom into the right spot, it won't let you save a location).