hello
it depends what you would like to do in dxb and how much money you want to spend. hotels in downtown dubai or on sheik zaed road(but they have transfers to a beach club) are cheaper than those on jumeirah beach. you also have to be aware that many hotels tell you,that they are in dubai, but they are 1,5 or 2h drives away in another region like fujarah oder sharjah(att in sharja you won't get any alcohol-even in hotels). also i should mention that at the moment there is a lot really lot of construction going on in dubai. i have never gone by road to oman, but i would say its save and the roads are in a good condition. what to do in dxb?there are a lot of shopping malls if you like to shop, very nice is also the sundowner tour into the desert, if you like waterslides wild wadi is the place to go. at the gold and spice souk you will find a lot of "look look cheap cheap-come in"! traders...my personal secret hint is "the irish village" its a pub in a public park and very nice to seat outside and have a couple of drinks...
hope this gives you a short overview, if you have any further questions just ctc me