The imminent execution of the murderous trio of Amrozi, Mukhlas, and Samudra has prompted the Australia government to issue a travel warning (People's Daily Online and Inquirer.net) asking Australians to reconsider their travel plans to Indonesia. And, if Australians insist on traveling to Indonesia, then they should avoid all locations that are likely to be targets of attack.
The idea that there will be a backlash (Gulf News) is dependent on so many things, particularly whether the extremists that the travel warning refers to, have the capability of carrying out an attack. It is wise to never underestimate your enemy, but there has not been a terrorist attack in Indonesia for a number of years.
This suggests one of two things; the terrorists are being patient or their capabilities of organizing and carrying out an attack have been severely compromised by law enforcements efforts in rounding them up and prosecuting them.
It is highly likely that there might be demonstrations over the executions and there will undoubtedly be large turnouts at the funerals of the three, and perhaps there may even be skirmishes at these events.
However, the best advice I have to offer is to have some self-awareness regarding the places you are in and where possible avoid putting yourself in harms way. So, if you think a likely target is a pub or a club, then do not go there. If you think it is a shopping mall then do not go there.